I noticed a user who was able to change their name after only 19 hours (and 2 minutes), somehow breaking the 30 days rare limit that should be imposed on this:
The above proves the name change occurred after 19 hours only.
I'm not sure how they did it1, but since they choose silly names each times that are impossible to even remember, it's irritating and I consider this abuse.
Can the bug please be fixed so that users can't change their name so often?
The screen name change rate limit doesn't exist anymore was fixed year and half ago, but obviously some loophole was missed.
1 I think they did it by changing their name on a site in private beta and choosing "Copy to all Sites".