This is nothing new, people have been making spellcheck commits all over github for years... and that was before ai slop even existed.
The amount of security advisories and PRs opened is getting out of hands. This is no longer just spell check PRs that you can merge in less than 1 minute of review. Often that's going to be supposed perf improvement, attempts at fixing things that are not broken, or submitting completely new features.
These relatively low effort PRs takes a lot of effort to review or even just to filter out.