I don't like that AI is consuming a lot of energy and reinforcing inequalities (and making oligarchs more powerful), and all that. But the fact that a good maintainer accepts to merge code coming from an AI that they have reviewed doesn't surprise me at all.
I am a maintainer myself (of smaller projects of course), and I can say that LLMs today write much better code than the average contribution by a random human... In fact the quality of the contributions I have been receiving has increase, because people use AI. It is still my responsibility to understand the code I merge, but nothing has changed there.