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So you can't censor sci-hub.now.sh (at least in the US, where linking is typically protected speech). So that's one thing.

Also, the actual DNS system doesn't have a way of redirecting you to another site when the record has been censored, so it's not very resilient in the first place.

Relevant similar site: https://dark.fail

I'd guess it's the same as what makes Wikipedia resilient: they're just links. As long as Wikipedia and Wikidata can link to the current location of Sci-Hub, why can't other sites?

The actual DNS system is vulnerable to domain registrar takedown requests.

namecoin tried to work around DNS centralized failure modes such as this. sad it hasn't taken off.