No there isn’t.
Stack Overflow is privately owned by Prosus. You have certain limited rights to the content they host but they do not have the obligation to keep the content up and they even have user terms that every account agrees to: especially for moderation.
Idk if usernames count as “attribution”, even, but I assume the results would be the same if an account was named Jeremy Assface, Ted Bundy, or Adolf Hitler even if the user’s actual name was such. Not to compare Luigi to any of those people, no, but the point is usernames are moderated.