Any person I see that is over a 10/1 KDR and isn't in a vehicle I automatically assume is cheating. In BF6, I'd say that happens about 1 every 3 matches. I have faced people who are insanely good, and playing the meta, and yet they are still getting about a 2, maybe 3/1 KDR. The people who pre-fire, 100% headshots, and perfect snap at 180 degrees... those actions just scream cheater.
This doesn't even consider the consolebots. Watching "skilled" gameplay of them is just like... wow, your aim assist hard tracks through everything even walls, and quick snaps to the face as soon as you sniff ADS. So skilled, much talent.