Blizzard has put AFKers on notice: According to a recent forum post, Overwatch is targeting some bad hombres, specifically players who create or join custom games with the intent of farming experience. Going forward, if players even think about joining a custom game with the intent of farming experience while away from keyboard, they may be on the receiving end of an account ban.
If you create a Custom Game that in any way encourages players to gain experience while inactive, you risk having your account banned. If you join any game mode – including Custom Games – with the intent of gaining experience while being inactive, you risk having your account banned. Also, do not name your Custom Game that in anyway even implies that gaining experience while inactive is OK – please do not even do this as a joke – because you are putting yourself at risk of having your account banned.
Director Jeff Kaplan asks that the community not force Blizzard to remove experience gain from custom games by reporting servers and not joining in on such shenanigans. More information can be found at the link below.