Some ideas I’ve had:

1. Use the wasteof wrapped website (which I’ve actually lost the link of and can’t find again, help) to find a limited amount of users, some with outdated usernames.

2. Use a reverse username checker for shorter names. For the unaware, a username check basically tries every username usually of a shorter length to see if it’s taken and logs the untaken ones. In this case it would remember the taken ones. This is possible for 2 and 3 chars (not necessary for 1chars though) but would take a long time for 4chars - it might still just be possible though.

3. Just… ask the moderators for a list of usernames? If there isn’t one, asking for a way to find every user might be possible. It could be worth a shot.

4. Crazy idea: today I found a user with 0 followers because the text やぁ was in a markovmoney post. This was in the user’s post as well - could it be possible to find users from markovmoney posts? Or is this just a one-time thing?