Early on... and we're talking vanilla.
I downloaded one. I only used it pre-barrens because I didn't find it very effective to level which was why I wanted it. I'm not sure what it was called. But basically you could map out paths for a given area, and if your toon encountered an enemy it would attack. I think you had like 5 abilities you could choose from, including loot. It would then find the preset path again, and continue on its course.
Worked really well for melee, and pretty terribly for casters.
Issues were that if the target got behind your character would pretty much just stand there and get beaten to death.
While I knew it probably wasn't the most 'ethical' thing to do. I didn't know at the time. I found out later thru a friend that it was a big no-no, I had already stopped at that point because of how inefficient it was.
It was never found out, or reported, to my knowledge. I was hacked at one point during BC... im quite certain this had something to do with it.
While this was a big no no. I can't say I'm all that sorry I used it. Because for the small amount of time I used it, it didn't have a negative impact on my community or the game. What it did do was teach me a good lesson, that I may not have learned otherwise, and it also made me very aware of what bot behavior looks like. Which i reported/report on a frequent basis.
Now, this was early on so blizzard's awareness or countermeasures may have changed. But given the fact that I still run into bots relatively frequently, don't you think that blizzard should be taking a more proactive approach to combatting botting, rather than waiting for someone to report them?