I tried to cancel the QUEUE and found a match at the exact time, got back to the menu and got banned

[kaleoalves2012]

The ban wasnt instant, I actually joined another match that someone left instantly, after getting the message "you can leave now" I left, tried to queue and got a 30min ban

 

[Lady Briar]

The ban happens after the game finishes.

 

[offsetcyan]

The ban wasnt instant, I actually joined another match that someone left instantly, after getting the message "you can leave now" I left, tried to queue and got a 30min ban

The game would benefit from a "confirm" button during matchmaking like CS2.