Just pick a random small instance. The catch is that larger instances that don’t block spam instances are probably going to have their own spam problem and get blocked by other networks.

I had a quick look and https://lemmy.sdf.org/ doesn’t seem to block or be blocked by anyone, according to this list: https://github.com/maltfield/awesome-lemmy-instances?tab=readme-ov-file

The real trick is the fact that both of these do damage, and you can’t afford to ignore either.

Signaling to the police that the executive branch has your back and will support you when you kill poor black men is going to get people straight up murdered.

I mean if everything is ephemeral and the users are anonymous and don’t log in, the federation wouldn’t actually do anything.