As someone who is very new to nostr, how is illegal content restricted if the protocol is censorship resistant?
Discussion
You decide who to block.
The protocol/client devs do not.
It's for once, your choice on what you see and don't.
Relay operators can decide what content to transmit. For example, they could impose custom restrictions, or put a pay wall there to limit the spam (paid relays).
If some relays start censoring you, you can just transmit your notes through some others, or even your own ones. As long as anyone "subscribes" for reading those relays, the communication works.