From my PoV it’s probably many of these projects are effectively public good spaces. Hosting a code repository has become less of an esoteric thing and turning into a public good benefit (like a physical library but virtual for code). Spaces like Reddit and Twitter are todays analogous of a public discussion forum in a park or at a bar.
Internet tools have become so ubiquitous they are critical to serve public needs and public benefits. However these internet spaces are increasingly commercialized and privatized, which runs against them being valuable public goods (see the difference between Wikipedia, run primarily for public benefit, and Wikia/Fandom).
Google gained control of the web by populating the world with Chrome/Chromium and wants to strong arm the web as a whole through it. Climbing the ladder and pulling it up from underneath them, with their fisted approach to Manifest V3 the beginning salvo.
For Google it’s just another day in the office.