Only idea I have had is to use templates for PRs and Issues with a required check box to tick "AI was not utilized in the generation of this PR/Issue". If it's not checked, auto-close that shit. If they lied, block them.

If github had like scarlet letters where maintainers you could easily see if any reputablable maintainers had ever reported a given dev for submitting a slop pr, then I think things would be a lot better I guess the problem is that this solves a problem for large project maintainers so it might be...