Overwatch tried that. People started blocking everyone better than them. In the end, one of the top widowmaker players couldn't find a match, because everyone w

Overwatch tried that. People started blocking everyone better than them. In the end, one of the top widowmaker players couldn't find a match, because everyone who didn't want to play against him had blocked him. Actually, I'm not sure block is the word blizzard used. Avoid, maybe? The end result was more or less the same.