Most popular anticheats like EAC, Vanguard, BattleEye, GameGuard operate at kernel level(on windows), thus they could read EVERYTHING, and run ANYTHING in your PC. Also remember FACEIT anticheat EULA https://cdn.discordapp.com/attachments/515517624474664961/1159417127137181786/eulafaceit.jpeg?ex=6530f258&is=651e7d58&hm=f0a5220b1351072ab4852e3ab1b3cca3ec53f5ae42c84484a68d2fdfaeecd175&