I think Gitlab has a similar name mechanism. I don’t use Gitlab really, don’t want to sign up, but occassionally log in via my existing Github account to gitlab.com and some others. Somehow, and I didn’t notice this at first, gitlab.com started signing me in as ‘aschrijver1’. How that happened idk, maybe I fiddled in Github mail settings but not that I can remember.
The result is a confusing situation for other gitlab users in that both ‘aschrijver’ and ‘aschrijver1’ accounts are me. Also should I value the contrib on those I’d not happy by this account split.