Seriously why? Discuss.online has horrible moderation and open-signups, and Lemm.ee isn’t very much better. If lemmy.world and sh.itjust.works were completely nuked to avoid the moderation headache or risks from two large open servers, why aren’t lemm.ee and discuss.online banned as well?
You as a user can block instances. So, those that want higher moderation can have it and those that want less can have it. When an instance bleeds toxicity, it makes sense to ban it for everyone.
Some users value the anonymity of open sign ups. Also, as the fediverse grows, it will become increasingly impossible to track which instances have which policies when anyone can spin one up at will.
Sadly we cannot on beehaw, its version is too old.
Oh, I forgot beehaw was not updating while they consider other platforms. I presume you will be able to id they decide to stay on Lemmy.