I piss off a lot of opposite faction players, in most BG's.
I'd imagine I get reported a lot.
Players on my own faction threaten to report me for botting, and I tell them to go ahead.

I've never had a GM talk to me about botting.
I've once had a GM show up, mention that boxing is really fun to watch, and hang out for a couple of hours watching me...

Usually, I'd imagine they check to see that the names on the accounts are all the same.
But probably nothing beyond that.