Gregory's Server
@grishka
Changing usernames is a big no-no, as far as I know. Not the least, because it makes the system vulnerable to impersonation. Also, imagine all Mastodon, Pleroma, Friendica instances having to rewrite posts as soon as someone changes usernames.
Don't do it.
@drq wait, which one do they use for mentions, the "id" or the "url"?
I created an account on Misskey because it uses different URIs for those, let's test: @grishka