alt Hacker NewsGNU didn't kick anything off. It was an attempt to document something that was already in full swing.
What was in full swing was Open Source, powered by scratch-your-own-itch. What was taking time was for the business world to learn the lessons by both carrot (Linux) and stick (Unix Wars, vendor lock-in, dozens of crappy competing standards). When Steve Balmer winds up using your language, you moved the ball.
Many ideas from The Cathedral & The Bazaar made it into The Lean Startup. The Cathedral development model was more related to waterfall. YC was already chugging along, but you can bet your ass PG was already steeped in the tea.
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You are arguing theology about who the cathedral metaphor was aimed at. The primary sources from ESR's own flagship pre-CatB project are public and open to examination.
Teenage Mutant Ninja Netnews (TMNN) was ESR's failed magnum opus, a solo netnews rewrite: long private work, one rough beta, then done. That is the isolated cathedral process CatB later criticised when it was other people's work. The tree from the historic tmnn7-8.tar.Z is here:
https://github.com/SimHacker/esr-tmnn7-8/tree/main
Read the LICENSE as evidence, not as law homework: anti-censorship language, FSF distancing, GPL-style terms, and a consulting pitch labeled as an unabashed commercial plug inside the license text:
https://github.com/SimHacker/esr-tmnn7-8/blob/main/LICENSE
Then read fascist.c: real filename, FASCIST and COMMUNIST compile switches, suppress/deny and ADM/authorized rules for who may post or read. That is operator gatekeeping in code, not a metaphor.
https://github.com/SimHacker/esr-tmnn7-8/blob/main/src/D.new...
ESR talks in that LICENSE like the speech police are the enemy. In the same distribution, fascist.c is the speech police: it encodes who may post, who may read, site suppressions, and deny rules off an authorized file. That is not a subtle contradiction. It is the same person packaging a freedom sermon with operator-controlled posting and reading. Calling that anything other than hypocrisy is charity he did not earn.
Huh? GNU absolutely kicked stuff off.