Gotcha!  But the reality is a bit more nuanced.  Nostr was blocked in china quite quickly.  Bluesky is 100x the size of nostr.  I think now it's 200x the size, growing 100x more in the last month.  It's blocked because it's big.  If nostr was that big, it would be blocked too.  Nostr relays are just web servers at the end of the day.  You can make the argument that its easier to run a relay than a web server, but that probably is not true.  Nostr has a bit of resilience which is a good thing, and better than the status quo.  But it can easily be blocked, its just too small to block right now.