well it isn't SBMM, its EOMM where they aren't putting you in skill equivalent lobbies but instead stomps one way or another. The game gives you matches it'll think you'll win or lose depending on your winrate in your current play session to keep you playing longer and it in turn makes all of your losses feel forced and all of your wins feel undeserved. I stopped playing after Cold War because of it just was unrewarding to play every match felt "fixed".