I Auto-Walk, whenever I want to type something out and am running into Walls, as I go. I can imagine some (not all) Auto-Walking, to get their characters somewhere, as the player (themselves) goes AFK.
I helped out somebody (in Un’Goro) for Small Thorium Veins, once. And, it would look like I was doing this because we were grouped up, and I wanted the person to go to my Dot.
And not killing them? 
The Bolded portion is important to note. Weird things be happening on my screen, too. Mounted Players I’m sure are running normally, yet on my screen, the Mounts are running sideways. Friends of mine getting DC’d shows them running in places.
These aren’t CLEAR distinguishers of what is and what isn’t a Bot. I’ll give you an example of a Bot, that I reported, and the behavior it was doing.
I found it odd, how this Nelf Hunter would Shadowmeld every single time, before it would pull the next mob (in Ashenvale). I found it strange, how the Hunter would send its pet off to the next Mob (aggressive, neutral, didn’t matter), almost immediately after killing the prior Mob. Then, its pathing got messed up and began running into a tree. Once it realized it was running into a tree, it stopped, made a perfect “turn around” to its last path and began walking 20 feet toward its backtrack pathing. Turned perfectly Right about 5 feet, turned back towards the tree and just ran into the same tree, again.
Normally, a regular Player wouldn’t walk back so far, when they’re caught on something. They’d just go around, as they get closer to something in their path. Not backtrack 20 feet. That’s not something we do. And, yes, I did report them and yes, I did receive in-game Mail thanking me for my report.
