Nostr is not resistant to government censorship, only corporate censorship, which is a lot of the ongoing online censorship, so that already makes the project important.
To maximize resistance to corporate censorship, however, we need, ideally, free relays which free speech policies that do not censor what they do not need to, so as to maximize freedom of speech.
Relays can remove anything. I think, ideally, we should have relays run by non-profit organizations with freedom of speech as a goal. 

 Also:

> Does the BITCOIN IS SPEECH argument help in protecting freedom of expression on Nostr? 

No. Nostr isn't Bitcoin. Nothing about Bitcoin will help anything about Nostr.