A post on Battle.net has news that following a series of bans for botting in Hearthstone, Blizzard has now issued permanent bans to a bunch of players for win-trading in the virtual card-based game (thanks PC Gamer). Here's what happened:

Fair play is at the heart of Hearthstone. The Ranked Play ladder is a place where players have the opportunity to duel and gauge their card-slinging prowess while climbing the ranks. Participating in Ranked Play should be fun, exciting, competitive, and fair.

We’ve recently banned Hearthstone accounts that were found to be participating in win trading. Win trading at any rank is something that we do not take lightly, and is in violation of our Terms of Use. As we mentioned in our previous statement regarding fair play in Hearthstone, instances of cheating will not be tolerated. Accounts that were discovered participating in win trading have received permanent account closure and disqualification from events where ranking is used as a method of qualification.