TF2 is overrun by bots farming hats. CS has always been completely infested at higher ranks like global elite. In both cases VAC is practically useless against any non-userspace hack.
Oh and VAC does nothing about it I see, thanks for your response
It's not right now, there was a huge banwave and it's been bot free for a couple of months now. If you have any nostalgia for TF2, now is the time to indulge.