About seeing difference between a legit player and a closet cheater I can agree if you reached the top yourself. I can definitely say that even if I'm getting killed repeatedly by someone if the person plays legit I can simply feel it in that person's movement, game sense, aiming skills. But often you have those very dodgy players whose weapons seem to be outperforming yours even though you both have the same mods. Overconfident players who seem to know a little too much and so on, or simply people who refuse to miss any shots even if you are trying to dodge like a kung-fu master. Then you can suspect that something might be off.
I would say that a decent amount of people will get banned for various triggerbots, macros ,smooth aim or maybe even scroll wheel shooting but you also shouldn't expect any crazy numbers. Many people play APB for many many years including also other games so they are simply good, that's all there is to it.
The truth is that those who are deluded into thinking that they are the best will keep hackusating people no matter if we will even have 10 anti cheats in APB. Although I'm looking forward to BattlEye + FairFight + the secret internal system that LO has. Might be a hell of a combo if it all gets configured properly.