Well this one trick banning discussion started with a post by XUL here
I'm a one trick that just got banned from Overwatch for playing a hero. • r/Overwatch.
He claims that the only reason he got banned was for one tricking torb. Me and my friends played with him and got steamrolled on the payload map since they were heavily countering torb.
My friend Activates picked torb on attack to see what XUL would play after we asked him kindly to swap to ANYTHING else as we were flexible on our picks.
XUL responded by saying he's just gonna afk then. Rather than picking another character and playing the game he decided he would just sit in base without picking a hero. He kept timing out and back in so he wouldn't get banned from competitive afterwards.
From his actions in this clip shown if another torb main was on the team and picked it first he would've went afk in the base and just lost the game for the team since he was unwilling to pick anything else. This is the problem with some of these one-tricks, it's not the one tricking itself, its the player. XUL got banned for griefing or delibrate inactivity.
PROOF: