A few months ago, their secondary system, "Trust Factor", was broken for an unknown period of time, which the communication to the community was a single tweet. During that period (probably a few weeks?), there was blatant cheaters in half the games I played.

I've moved to playing FACEIT (a third-party matchmaking service) recently, partly due to anti-cheat. I don't remember the last time I saw a cheater in FACEIT, while CSGO's matchmaking has cheaters in around 10% of my games (average skill player, ~2k hours over 7 years, high Trust Factor).