It's been used to cheat in professional CS:GO tournament from what I remember. They can have a second PC where the cheat run which read the memory of the game on the clean computer and can for example display the position of the other players on a second screen.
They use this type of hardware:
https://www.raptor-dma.com/raptordma-home/
It's been used to cheat in professional CS:GO tournament from what I remember. They can have a second PC where the cheat run which read the memory of the game on the clean computer and can for example display the position of the other players on a second screen.