People buy dma cards and displayport/hdmi mergers to avoid hack detection. Another pc reads memory of your gaming machine through the dma card that creates your ESP overlay and then dp/hdmi is merged through a box. The dma card runs custom firmware that pretends to be some benign peripheral like an usb or soundcard.
There's also hardware aimbot/triggerbot that reads your video output then sends input to a device connected to your mouse.
Its not what your everyday cheater has in free to play games like cs or cod but there are games where it matters more if you're banned, and when cheat subscriptions can be $100-200 a month the hardware cost isn't much.
DMA cheats are not detected. What happened is thousands of cheaters all bought firmware from the same guy, and Riot was able to determine via stats that this group of people with the same obscure "network card" had outlier stats, and they banned them all. DMA is by definition not detectable, but human idiocy is.
If you just go and buy a card and use the normal firmware you're gonna get banned. Cheat creators make custom firmware to avoid that. It might be that Faceit is small enough to investigate cheaters thoroughly to get most of them, and with their reputation it might discourage most to even try. But I don't think that scales enough for big games unless you have Riot money.
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There's also hardware aimbot/triggerbot that reads your video output then sends input to a device connected to your mouse.
Its not what your everyday cheater has in free to play games like cs or cod but there are games where it matters more if you're banned, and when cheat subscriptions can be $100-200 a month the hardware cost isn't much.