Die Website ist relevant genug um einen kurzen Wikipedia-Artikel zu haben: https://de.wikipedia.org/wiki/Caschys_Blog Aber ja, man muss den Blog nicht gut finden.
Original der Meldung findest du etwa hier: https://workspaceupdates.googleblog.com/2023/07/adding-line-numbers-to-google-docs.html
The project itself always decides, unless you fork the project and do your own thing. You can wave a carrot in front of them (if you do X then you get $Y), but the relevant factor is going to be the size of the carrot $Y, not directly the "collective bargaining" via that platform. How would your platform facilitate finding a stronger negotiation position?
It sounds like you may have discovered the "fiscal sponsor" concept. There are a couple of nonprofits already offering such services, such as the Software Freedom Conservancy or OpenCollective. The foundations like Linux Foundation, Apache Foundation, or Eclipse Foundation also come to mind.
However, for all of these the project decides to join a host. Foundations can't just annex projects.