Make it possible to turn off PRs from new accounts, accounts with a low PR acceptance rate or accounts that create lots of PRs all at once in unrelated projects

Make it possible to turn off PRs from new accounts, accounts with a low PR acceptance rate or accounts that create lots of PRs all at once in unrelated projects. Or mark those kinds of PRs in a visible special way. Or make those kinds of issues and PRs non-public so that maintainers can silently drop them without creating publicity for the slop-spammers.