I think this reasoning vastly underestimates how many free or dirt-cheap options there are out there. In my opinion, NIP-05 verification is a band-aid measure at best. We can’t blacklist all free or cheap top-level domains without impacting a lot of legitimate Nostr users. For instance, are relay operators willing to blacklist free NIP-05 services like Nostrum, zaps.lol, Nostrcheck.me, etc.? Because we live in a ChatGPT/Claude world, and script kiddies can easily mass-register using a combination of these services.