To whom? It's not against Github's ToS to submit a bad PR. Anyway, bad actors can just create new accounts. It makes more sense to circulate whitelists of people who are known not to be bad actors.
I also like the flexibility of a system like this. You don't have to completely refuse contributions from people who aren't whitelisted, but since the general admission queue is much longer and full of slop, it makes sense to give known good actors a shortcut to being given your attention.
Sufficiently bad PRs/comments/etc. are against the GitHub Terms of Service, look under section C (Acceptable Use), which links to https://docs.github.com/en/site-policy/acceptable-use-polici..., which then includes https://docs.github.com/en/site-policy/acceptable-use-polici..., on which you'll find multiple actions would describe posting AI slop (or things ancillary to it).
I wouldn't do this where it's not clear there was an issue, but for something like the really poor OCaml PR that was floating around, reporting the user to me seems like a logical step to reduce the flood.
But I can also see how this will be used as one more arrow in the quiver of NIMBYs. In addition to environmental, economic, political reasons not to build something, also consider the cost to potentially breaking existing community bonds. We shouldn’t build new high density housing because the new residents will never be able to replicate the community of the previous low density single family home neighbourhood.
You can tell this is a NIMBY piece because it doesn’t touch on how to build new communities, just that existing ones exist and new ones can’t be built and even if they can they’ll be poor imitations of the old ones. So instead of trying to build new things, let’s preserve what we have already. It would have been more interesting and honest if it had explored the role of say, third spaces and how consciously creating the right conditions can lead to community formation.
After all, even the communities that exist today were empty land once upon a time, until we built the infrastructure and community within. If all we ever did was preserve we wouldn’t even have the communities today that we value so much.