Why do you say that? Several people here said they have been helped by it. Seems they would.

If all the spam commits are suddenly focused on only participating repos, that will quickly change.

Maybe, maybe not. It's hard to really know without trying it and measuring.

Loads of projects, particularly recent ones, would gladly welcome any help and increase in visibility.

I dream of the day I can walk into a job interview and brag about how many PRs my Open Source projects have to reject per day. Maybe that's just my Nobody Privilege talking though.