Its only on primal and it seems the issue may be manual banning instead of auto spam blocking? I am sure it will be rectified soon. The early bitcoin devs had things to work through as well.
Discussion
Maybe because something was said against Primal, and the dev didn't take it lightly, but #nostriches thought all the while that #NOSTR is decentralized so it's like gagging the one who said that and condemning the others that took part in the game, so that's clear censorship, but oh well, let's see what happens next