[bloppe]

That kinda sounds like draft PRs. You can make all PRs drafts by default. I guess it would be cool to have a setting where only maintainers can change it to ready-for-review.

[halapro]

If the PR exists on my repo, it's already too late.

Either you let me block 6-month old accounts from opening PRs, or you let me delete them.

PRs, draft or not, show up in searches and spammers can continue opening new ones as well as leaving comments on them.