That is correct. Nostr is the protocol which you can’t censor. Clients, such as Primal, are how you interact with the protocol and set up rules for their own relays. You can use your npub/nsec in any client. When you don’t like how a client does something you can move to another client and still have all of your nostr history, follows, mute list etc.

You can use other clients, depending on your device. On desktop I really like jumble.social On iOS, I think nostur and Yakihonne are fantastic On Android, it seems that wisp and amethyst are the best options