Hello, I joined this game in 2015 but I played a bit casually and almost always real time until few months ago.
I noticed that during most open tournaments at least 1 of 5 (maybe 1 of 4) games end with someone who gets booted, most of the times on turn 1. That boot rate is higher than the one of casual games out of tournaments and in my opinion happens because you do not usually know how much the tournament will last when you join it and, expecially if you win some games and then you have to wait long time to be paired with your next opponent, you just forget of a tournament started in the months before and it happens often that when the new game starts you do not check the game at all.
Extreme example: https://www.warzone.com/MultiPlayer?GameID=27071878
I think that people should be able at least not to get booted like that, being able to retire from a tournament when you are not interested anymore and maybe letting the last defeated player advance if he rejoins the tournament.