@pfefferle I'm backing everything related to self-owned online identities! Just like you mentioned, the rel-me and personal website stuff, that does make sense IMHO.
Mastodon verification of domain ownership is a bit superficial on that front. I'd love to have a stronger sense of identity there, and in the Fediverse at large, to tie together accounts.
I don't dislike Gravatar's service there, either. Am using them for ages. I just don't trust in other service's security anymore :)