[mftrhu]

> Hell, it would be all to easy for adversarial group to just server hop and get a bunch of sites blocked purely because the mods of those sites are not on 24/7... or just allow for free speech

Nah. De-federating is manual. Such an adversarial group would need to join up, start spamming, and keep on spamming long enough for their instance to be added to a blacklist, and for other admins to pull that blacklist in, without the admin ever acting in the meantime.

It's not like the fediverse is that big, either - people talk to each other.