Michael Saylor mentioned some features he is interested in developing on the MicroStrategy World conference. He talked about DID (decentralized ID) running on Bitcoin, I believe using ordinals. So if he is interested, then maybe ordinals aren't completely useless. This way you could host your PGP keys or something like that in a decentralized network instead of depending on some servers that can be seized, compromised or otherwise tampered with.
What is wrong with using conventional PGP keyservers to upload your PGP keys on? They are already well-supported.
They also mentioned an idea of using LN payments to stop spam email, fake accounts running crypto scams and so on, by using micropayments.
I don't think so. It seems that spammers have enough
money to
bombard you with 1 sat transactions. What is a few hundred sats for them?