A question about aimbots

I have no idea where this is supposed to go, so here it is.
As all of you are aware, aimbots have existed for almost all games that involve aiming (#captainobvious).
That means that an external program is capable of reading the coordinates of a moving target, and locking the user's sight on that target.
My question is this :

Why exactly are softer aimbots
~[i.e. aim-assist programs (moving cursor towards acquired target increases distance traveled, moving away decreases it, and/or
~constant movement towards the target, not clipping onto it)]
not easily found (if at all, I have no idea) around the forums?
Is the matter popularity? (I highly doubt that).
Is it hard to code one?
Too heavy on the machine running it?

Any contribution is welcome, even ones about where else this could be posted. Thank you.