There is no need to change activitypub for that. Relays already do exactly what you are asking.

community-funded

Community underfunded. What the community is giving out barely covers the cost of the hardware, much less the labor of the admins.

Last year I considered offering accounts via a Caffe Sospeso on Communick, but it quickly became clear that is was going to suffer from the tragedy of the commons. Everyone that was willing to bear the actual operating costs would prefer to run their own servers to serve themselves, and the ones that were asking for “community supported” accounts were overwhelming just interested in free-riding.

I agree with your diagnosis, but I disagree with your treatment. You are doing the same mistake I did when I implemented content mirroring on alien.top: you are putting out so much automated “content” that outsiders will look at this and think the community is just a place for you to dump links.

Also, please drop the main character syndrome and the “Reddit agent” paranoia. You have multiple people here telling you that your approach is harmful to the groups that are already here. It’s not a conspiracy. Reddit doesn’t care about you.