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
I might be ootl, but as far as we know, wasn’t EAC ruled out? I recall watching Pirate Software’s videos breaking everything down, and iirc, it was more likely that the individual computers were compromised at some point than it was remote code execution. Though it was still up in the air what the hacker could do, as they seemed to be able to send commands the server would accept (eg, gifting thousands of packs to steamers live on stream). Been a while since I watched, and the vids are also hours long so I don’t expect anyone else to sit through it, but here’s the first if anyone’s interested. Apex Legends Vulnerabilities - Breakdown and Interview