Real Nostr clients don't require any servers, they can work completely on the client side.

The fact that we have apps that still work perfectly well but are now inaccessible because a domain name has expired (or whatever) is some bullshit we inherited from the "web" world that we should try to circumvent, not embrace.

There are multiple ways to circumvent these flaws and build true Nostr clients that can't be controlled by anyone, not even by their original author.