These "contributions", while they did exist in small quantities, mostly were not actually what you've described there.
Instead, those boiled down to unsolicited opinions, hostile takeover attempts, value extraction, general drama and just overall overhead over simply building code.
This was not always the case, but the GitHub model of building FOSS (and removal of all friction) certainly made it the new default.
Said model was always unsustainable, but the burn rate made it sustainable enough so that we could just throw more humans at the problem to replace the burnt-out ones.
AI pushed the burn rate over the replacement rate.
=> We will likely see more projects adapt this or a similar stance I think.