There's a few rumors I've seen in game, not sure if they're true or not (But they seem pretty likely to me at least), that originally when the game came out a lot of the bots would actually make note of your player name, so if any bot had seen your name, then all bots from the same RMT group would have your name on their 'list of people to piss off' as well.

And while I would like to be able to remove my name from the search, I still like the option others have mentioned in the past where if you're set to busy, only friends and/or FC members can message you in game.