Addons are fully traceable because they need to access the game API. They are also fully dependent on what sections of the API are exposed and how the developers want people to use the addons.

Bots are not limited and unrelated to addons, because they do not use any API and do not interact directly with any game code in any fashion. They replicate human behavior via automated button presses and mouse movements. They are completely untraceable in any automatic way and require large amounts of human investigation on a case-by-case basis.

Games that expose their API and are smart about it in restricting their usage like not allowing API that performs character actions are no more at risk of having bots than games who don't have an API at all.