My friend's account (handle:nyahh) was disabled yesterday. He received no emails or notifications explaining the cause. He hasn't participated in any contest in the first place, so there hasn't been any rule violation to the best of our knowledge.

If we had to guess, it might be because of a browser extension he was using to improve the UI, or because he spent the entire day solving archived questions (did ~50 of them) which may have gotten him flagged as a spam account. Either way, MikeMirzayanov we kindly request you to look into this case and unban his account if possible.

If it's the former reason, he'll make sure not to use underground extensions again. In case of the latter (or some other reason we are unaware of), we would appreciate a warning system so genuine users can avoid unintentionally triggering the flagging system.