I don't know if it's been brought up, but in ffxi when SE discovered the duplication exploit from salvage they did widespread banning of accounts/characters... I don't think anyone felt the response was even remotely fair.

I have mixed feelings about SE's stance on powerleveling, but calling for punishment for the people who are gaining from it won't really solve anything. If it's an issue working other than intended then SE's only prerogative should be to fix it asap, not to mete out punishment to the people who have used it.