A bit sad to see this. Of course they are free to do it the way they prefer, and there are successful projects like this (Notably SQLite) but there has to be a reasonable middle ground between "everyone can just flood us with 30,000-line 'Claude implement feature X make no mistakes' PRs" and "we're not open to outside contributions"
How would you decide what is the middle ground though? If a project allows some AI-generated PR if its good quality, then it is a burden on the reviewer on what is considered good or not.