Hey Martti. Not sure if this is the right place, but I don't think I have another option save of sending you the DM.

Would you share your opinion on extending NIP-05 to include web3 domains? (or raising like NIP-05a)

like these: https://unstoppabledomains.com/?ref=e9ae3f7dee5a40c

or maybe ENS, but these are kind of subscription-based

They are not part of the ICANN, but it does not feel like it will be too complex to implement.