From what i understand Blizz is using MMR which is based on our performance. So they monitor how players perform and got all the metrics to put smurfs in their own Q.
If a player has wild swings in their performance: 3 matches 5-40 and 3 matches 40-5, huge swings in Acc, etc. Place them in a seperate Q. People who have insane swings in their performance to such an extent should but a big warning sign that something is off (e.g. throwing to stay low and then stomping and repeat). Lez them fight eachother
This is not correct for the most part. MMR is based primarily based on your wins and losses throughout your history of playing the game. There are some minor influences including a metric of hero performance (but only for Platinum and Lower ranks), but in the end you need to figure out how to win games consistently to earn rank. Full details about how matchmaking works can be found here:
