Nostr

Nostr is the most censorship-resistant option here because it is a protocol rather than a platform. There is no company and no central server. You hold a keypair. Your posts travel through relays that anyone can run. You read them in a client like Damus on iOS or Amethyst on Android. No one can deplatform you across the whole network, only from a single relay that you can route around. It is tightly tied to Bitcoin, with Lightning zaps for tipping baked into the culture. The cost is in the setup. Keys, relays, and a patchwork of clients ask more of you than signing up to an app. It is the strongest pick when resistance to censorship is the whole point.