Nope, that's one of the reasons it's resistant to censorship. One app gets taken down, another pops up and you just keep your nsec safe and log right back in a different app. The relays(where all your info is stored) is the other part, but that is mostly backend stuff you shouldn't have to worry about. It's a bit overwhelming for a lot of people coming from a login/password world, but you seem to be getting the hang of it. You got this 👊