Vanguard takes screenshots of your PC every time you play a game. Every time you play a game a function is called to screenshot your PC’s screen, in case Vanguard thinks you might have something suspicious, it screenshots your ENTIRE PC screen (all monitors).
Edit: Not trying to spread false info this was shared to me via a friend and there is other data to back up that this is real https://www.unknowncheats.me/forum/anti-cheat-bypass/634974-vanguard-taking-screenshot-pc.html
https://www.unknowncheats.me/forum/valorant/484475-vanguard-screenshots.html
Many people criticize that, but I can’t really think of any non invasive solution to draw away cheaters, except making specialized device to play the game (sort of PS4 to play one single game only?), but pretty sure it won’t take long for cheat providers to crack it as well… Sadly.
server side anticheat is the only ultimate solution.
all client side anticheat measures will have vulnerabilities that will be found and people will cheat. (look at DMA pci cards, for instance)
How would a server side anti-cheat prevent a DMA exploit?
Don’t send opponents location until they are visible for example. That way a wallhack won’t work.