They may have logs but they don't have perfect logs. I know people who got banned for having debuggers open not attached to the game. The VAC system is also i

They may have logs but they don't have perfect logs. I know people who got banned for having debuggers open not attached to the game. The VAC system is also incredibly intrusive. It was scanning random processes on my computer, and I know this because when I tried to recompile my program, it failed because it couldn't delete the executable because Steam had an open handle on it... You would never hear about Valve failing in these cases because no random person would trust testimony from random people over Valve.