You could even tell people to follow other people at their own domain, like follow "mike@mikedilger.com" and it would get my NIP-05, find my relays, and gossip away. Works without even NIP-65 relay lists for discovery, no npubs required, no user interaction with relay setup required. Seriously easy 1-step 1-click experience. The only thing people MUST do is to sign up for at least one relay that serves their stuff.