Ah yes, vacnet, which couldn't even reliably ban spin-botters for YEARS. Vacnet is an abysmal failure and should be seen as such. The game is still brimming with cheaters, and you still basically cannot play a game on valve's official servers with high ratings unless you are willing to get matched with a cheater 1 out of 3 times and waste hours on unwinnable games that you get punished for abandoning.