That said the amount of work it would require to try and do something like this that still wouldn't really work correctly especially when the game already gives you a good amount of information with spotting and the minimap and grenade indicators that something like this would be a waste of time. ”It is indeed a line that people wouldnt want crossed but the devs have said that a simple crosshair overlay is fine if you start doing the other things then well they didnt say that was ok and can be banned. Sure, it wouldn't be very effective or accurate, but that is a fine line you don't want to cross. Given an overlay program, and some image processing, it's not a huge stretch to start tracking player movements, or ingame objects such as projectiles/grenades/mines etc (aka wallhacks/ESP).
↑ “ Well, in all honesty, a piece of tape and sharpie has zero chance of exposing things about the game, so I have no issue with that.