Blizzard have announced in a forum post they have banned 22,865 Korean players from Overwatch for hacking. The hackers were using third-party programs allowing them to have an edge on their competition.
Blizzard said in the statement..
“Creating and delivering a pleasant game environment for the majority of good players is of paramount importance to us and we are committed to taking all the steps we can take to create, distribute and use our programs. We are also aware of the fact that our programs are circulated through various communities, and we will prepare countermeasures.”