Not OP but requested this feature since years.

Your suggestion would help a bit but I would prefer the opposite: before someone can 'pollute' my pull request space and draw attention from subscribers I would prefer an acceptance step (just like a moderator on a forum) instead of having to archive the PRs.

This is especially important as (AI) spam increases and just because I am away for a few days or weeks I don't want those PRs lurking around.