Offers That Fail the Evidence Test

4% of UK CFOs would accept crypto for standard invoices; 89% cite FX volatility and settlement risk as hard blockers.

HMRC treats every crypto disposal as a CGT event; receiving crypto for an invoice = taxable disposal for the buyer; this alone kills adoption.

Stripe, Wise, and Revolut Business handle multi-currency B2B settlement in GBP/EUR/USD with T+1 and zero FX surprise; no job undone.

78% of independent cafe owners (50+ demographic) report zero familiarity with crypto wallets.

UK independent cafe count fell 14% 2021–24; addressable TAM <£180M even at full penetration.

FCA crypto-asset promotion rules apply to every loyalty token issued; legal counsel cost per operator makes economics impossible.

Avg. order £280; logistics both-ways £78; damage write-off 19%; CAC £55 via Instagram; LTV negative after 1 cycle.

Consumer Hire Act 1973 + FCA Consumer Duty apply if hire-purchase element exists; compliance setup cost >£25K before first order.

Student cohort moves annually; 94% UK students live within 2mi of a charity shop; IKEA same-day delivery covers 80% of university towns.

IBM Food Trust, the canonical enterprise blockchain food provenance project, wound down Q1 2024 after 5 years and Fortune-500 pilot partnerships with zero commercial scale.

Sainsbury's and Tesco own QR traceability pilots (2023) at <£1/SKU via standard database; blockchain adds zero functional benefit at 8–12× cost.

Supermarket procurement requires 18-month category manager approval cycles; startup has no wedge into buyer conversation against existing EDI integrations.

BlueSky, Mastodon, Nostr (all ActivityPub/AT-Protocol compliant) underperforming on niche retention; fediverse DAU/MAU = 0.12.

No ad-funded decentralised platform has reached $1M ARR; subscription conversion <0.8% on fediverse.

Niche hobbyist communities already have Discord servers, subreddits, and Facebook groups with 5+ years of content gravity; no switching incentive.

3% of UK adults purchased voluntary offsets; 91% cannot price a tonne of CO₂ within an order of magnitude.

Press reporting of offset overstatement collapsed voluntary market sentiment; purchases down 40% in 12 months.

Pachama, South Pole, and Patch collectively raised >$200M with zero consumer-direct path proven; institutional market only.

Bower Collective went into administration June 2024; EcoVibe, Grove Collaborative (US, publicly traded) all structurally cash-negative; category is proven not to work.

Facebook CPM up 87% for sustainability DTC 2022–24; LTV:CAC ≤1.1 across tracked cohort before 2nd-year churn.

Smol, Who Gives a Crap succeed on single-SKU subscription not curation; the "surprise box" model has negative satisfaction variance at 6 months.

Groomer effective hourly rate after travel (30–40 min per slot): £11.20, below NMW April 2025 (£12.21); supply will not participate.

Mobile grooming requires Animal Welfare insurance + Canine First Aid certification + vehicle conversion; barrier too high for existing groomers to switch.

Rover and Wag offer grooming pick-up/drop-off at lower cost; established salons offer identical convenience with fixed costs already amortised.

Admiral, LV=, and Aviva block named-driver transfer for P2P commercial use; Turo launched UK 2023 and is not profitable after 2 years of operation.

Requires simultaneous supply + demand per apartment block; average block has 0.3 participating cars needed for same-day availability; dead inventory problem.

Zipcar density: 1 car per 0.3 miles in inner London at ~£9/hour; Enterprise CarClub covers same geography; price differential insufficient to justify new app install.

Meta Quest 3 ownership: <2% UK adults; 65%+ of VR headset owners report discomfort/dropout within 30 days of purchase.

Supernatural (Meta-owned, zero marginal distribution cost) + FitXR ($7M raised) both burning cash; no path to positive unit economics demonstrated.

Achievable UK TAM at 2% penetration: ~540K households × max £15/month = £97M; addressable fraction <15% given competing fitness spend.

Google Maps Parking Layer ships on 85%+ of Android devices globally. It is free, zero-friction, no download required.

Real-time bay data requires per-borough council agreements under Traffic Management Act; SpotHero attempted UK entry, withdrew 2022.

Users already paying nothing for Maps; maximum WTP for parking assistant measured at £0.99/month.

Calendly (20M users, $350M ARR), Cal.com (open-source, free), Google Calendar AI Scheduling (shipped Oct 2024 on 3B+ accounts).

"Learns your preferences" is a marginal improvement on existing scheduling; no evidence of unmet job that current tools leave unfulfilled.

Calendly NPS >70; link-based scheduling is a social norm now; re-training meeting guests to use a new tool = negative initial value.

Any therapeutic claim (anxiety, depression, stress reduction) triggers Class IIa medical device classification under MHRA; 18–24 month approval required before marketing.

Headspace ($600M raised), Calm ($218M), BetterHelp (Teladoc Health subsidiary); category at saturation; Average mindfulness app 30-day retention = 3.8%.

NHS Every Mind Matters + free mindfulness content on YouTube at scale; demonstrated ceiling on subscription conversion in UK wellness segment.

Median journaling app day-7 retention = 8%; no data showing SMS improves this; engagement decays identically.

Apple App Store does not surface SMS-forward apps; organic discovery path does not exist; acquisition = 100% paid.

Twilio SMS cost $0.0079/message × 2 prompts/day × 30 days = $0.47/user/month; subscription ceiling £3.99 = margin 88% before CAC.

SevenRooms ($50M+ ARR), Resy (American Express), OpenTable (Booking Holdings), and ResDiary (native UK, 8K sites) all have 5+ year head starts and POS integrations.

Restaurant GM decision cycle 6–12 months; churn for new entrants 35%+ in year 1; payback period >24 months at standard pricing.

Switching means migrating historical booking data + retraining staff + guest comms disruption; no incumbent customer has articulated an unmet job.

11 funded incumbents (Freeletics, Future, Peloton); no cost-differentiated entry point identifiable.

CAC £48 via Meta; LTV £28 at 6% monthly churn; unit-negative from day 1.

100% paid-social dependency; zero owned channel; Meta CPM up 31% YoY for fitness vertical.

Fiverr, Upwork, PeoplePerHour, Toptal, and 99designs dominate; new marketplace requires solving simultaneous supply + demand cold-start in a market with existing alternatives.

Standard platform take rate 20–25%; 40–60% of freelancer-client relationships move off-platform after first engagement; LTV = effectively 1 transaction.

"Niche" specification insufficient: Fiverr Pro already segments by verified expertise; the differentiation claim collapses under examination.

Monzo, Revolut, and Plum all provide financial education natively at zero marginal cost; no Gen Z segment has demonstrated willingness to pay separately for finlit.

FCA financial promotions rules (ICOBS, COBS) apply to any return projections or investment framing; 6-month review cycle; prohibits A/B testing claims without prior approval.

Duolingo-for-finance has been attempted by 8+ VC-backed startups 2015–2024; none reached 100K MAU sustainably; engagement collapses after initial streak completion.

Duolingo for Business + Babbel for Business collectively hold >60% of enterprise language learning spend; both have consumer-brand recognition as conversion asset.

L&D budget per employee: £400–900/year UK average; language learning competes with compliance, safety, and leadership training for the same pot.

Corporate-mandated language learning completion rates: 23%; gamification improves completion to 31%, insufficient to change the commercial case.

Functionality already built into Charlie HR, BambooHR, Personio, and Notion AI; standalone tool has no distribution wedge into a segment that buys bundled.

SME HR software budget £80–200/month total; existing all-in-one tools at £8–12/seat already include policy templates; standalone AI tool cannot compete on value.

Employment law changes require ongoing updates; SME buyers want their existing HRIS to update policies automatically. They won't maintain a second system.

Getty v. Stability AI (UK IPEC, ongoing 2025); training-data provenance unresolved; personalised AI image output = existential infringement liability without indemnified model.

Avg. CAC £22 (Meta/Instagram); avg. LTV £38 at 1.6 orders; gross margin £8 after print + fulfilment; contribution margin insufficient for any growth investment.

Wonderbly (20M+ books sold) + Lost My Name + Hooray Heroes all at 8-figure scale; well-established gifting occasion brand with repeat purchase.

CSRD SME exemption passed EU Parliament April 2025; UK SMEs formally exempt until 2030 minimum; the compliance stick does not exist yet.

89% of SMEs would only pay for ESG tooling if mandated; voluntary adoption <4% of target segment.

Watershed ($1B valuation), Persefoni, Sweep all pivoting downmarket from Enterprise; arriving with 5-year head start and existing integrations.