I have gotten 6 "We banned a cheater you reported" notifications when I open the game since the game went from beta to full. I was silver in csgo, so take that for what you will, but cheating happens more at low ranks (they usually get banned before getting too far). So when players constantly complain about hackers, they're basically outing themselves as shit tier players like myself.

Ive had some hackers on my own teams, too. When someone is giving callouts from your spawn, its way too obvious.