Then they spend $3.99 on another domain and are back in 5 minutes 🤣
Discussion
That can happen on the Fediverse or anywhere too.
You can block them in 1 minute or less.
There's a qualitative difference between NIP 05 verification and a Fedi server, for multiple reasons. NOSTR relays will accept new content more or less indiscriminately, for one. A Fedi server won't even know a new account exists unless there's already a connection.
That's not how any work.
If Nostr does nip05 only, like Ditto, any non-nip05 account won't write any activity.
On Fedi, you can add a Relay or friend, post something, and federate