Unfortunately that would be really hard to do without creating a "did we detect cheats" oracle. If they did that, the only thing a person creating a cheating tool needs to do is play a few games to make sure the tool is not detected anymore.
But is that not exactly what cheaters are doing right now? I reckon it would make less sense to implement this kind of system in games which aren't free. The price of the game disincentivizes cheating and makes consecutive iterations of the cheat harder. However, Apex Legends is free. Every time a cheat is detected nothing withholds its developer of creating a new account for the next iteration.
Sometimes... VAC can kick you mid-game for very obvious things. But in other cases you may be able to play for hours until a report goes through and gets verified. That delay (as a side-effect) guarantees that you can't quickly iterate and get immediate feedback on whether you're detected or not.
the idea is that cheaters would find it more fun to play in the tool-assisted mode. obviously there will still be some black-hats who try to hack the main mode.
