Relays are servers, so relays are at least as resistent as any other self-hosted server. Which is quite resistent.
Discussion
By that logic, the entire internet is resistant to censorship, but that’s not true. Authorities hide and delete vast amounts of information, and LLMs, which lie, are replacing traditional search.
Yes, but the Internet is much more censorship-resistant than what came before it. It's a progession, with no claim to perfection.
Arguably the best and briefest description of our current incarnation of the web.