UNITY — the engine under roughly half the world’s games — announced a RUNTIME FEE September 12th: per-INSTALL charges, applied retroactively to already-shipped games, calculated by Unity’s own opaque telemetry, hitting hardest the exact indie-and-mobile studios whose success stories built the platform’s brand. The developer revolt was total and instant: studios publicly pledging engine migration (Godot’s donations spiked 4x in a week), collective open letters, some devs disabling Unity ads mid-monetization in protest, and — the detail that graduated it from pricing dispute to trust collapse — the company had QUIETLY DELETED its GitHub repo tracking terms-of-service changes months earlier, the receipts-vanishing move that converts customers into archivists (#047’s emails-are-forever doctrine: the internet had the diffs anyway). The file’s structural read, and it’s the #255 Reddit lesson wearing an engine license: platform pricing power is real but BOUNDED BY MIGRATION COST, and retroactivity is the one move that revalues migration cost overnight — a fee on the FUTURE is a negotiation; a fee on the PAST is an expropriation, and developers reprice platform RISK (not platform price) accordingly, permanently (#054’s Meerkat, #211’s OnlyFans, #255’s Apollo: the graveyard’s common headstone reads “the terms changed underneath us”). Walkback is already in motion (apology posted, revisions promised — the CEO’s exit within the month is this file’s confident pre-registration); the trust, per every precedent in this archive, follows a different and slower curve than the pricing.

The fortnight’s quieter platform note rhymes: the iPhone 15 shipped with USB-C — Apple’s proprietary Lightning port killed not by courage (#090) but by EU REGULATION (the common-charger directive; Brussels ships hardware specs now — #131’s effect reaching the physical layer), and the file notes the asymmetry with a decade’s amusement: the company that deletes ports proudly needed a legislature to add one. ARM’s IPO, meanwhile, priced and popped (#260’s test passed; the AI-listing window is officially open — the #254 compute trade now has a public-market yield curve).

TIL: per-install attribution’s impossibility — Unity’s fee required distinguishing installs from reinstalls, piracy, and charity bundles via telemetry it couldn’t fully defend, meaning the INVOICE ITSELF was unauditable (#240’s proof-of-reserves doctrine: one-sided attestations are theater, now in billing form). Never ship a fee your own data can’t defend in discovery (#232’s boring-documents clause, invoicing edition).