nostr is censorship resistant because:

1. the follow list is decentralized
2. there are multiple relays

Normal users can resist censorship by switching relays, or ultimately run their own relay and they cannot be censored on follow lists because each follower owns their own follow list, it doesn't even need to exist on a relay, can exists primarily on everyones own device while syncing to relays.

Relays stopping spam doesn't mean nostr can be censored, it just means whatever was stopped was something no ones care about enough to either be followed or hosted on a different relay.