and yet some OSS (projects not really known for 1 and 2) multiplied change velocity the last year, implementing features via what is essentially vibecoding.

If you look at that, this approach is producing a pile of slop, where one LLM implements a feature, two weeks later another LLM spots an edge case and without much human review just crams in the code to fix that. Even at 1-2 months of that, those repos have significant changes and the commit messages get weird. I wonder what happens if the LLM won't spit out a fix anymore?

Will the human maintainers who started this process because noone thanked them and noone wanted to work with them on their bright new ideas just reset to the last commit they understand? Will they drop the project? The sunk cost for them is enormous. The time-effort required to fix the mess is gargantuan already. To me it increasingly seems that after the LLM industry robbed most humans of their collective labour output it will now rob them of labour aka time as well. Some people (like you and me) seem to notice that but most just go on and essentially spend away their life on machines now. I guess the problem is that most of these people have been severely cut off from using their own agency.