Posted on 2p2 by a mod and friend of one of the "bot" account owners:

Quote Originally Posted by nation
All,

I know chuck, the owner of full_tilting. I hesitated to write anything on the subject because he didn't want to draw more attention, but you guys are harassing him at the tables, so might as well prove you guys wrong instead of ignoring it.

Chuck is not using any form of a bot. He plays on full_tilting, and his friends play on the other accounts. They come over, play from the same IP address on different computers, and play exactly the same because they chop up all the profits. They sit next to each other and help each other out with difficult decisions, which is perfectly within the terms and conditions of FTP.

They are hard core grinders. They sit there all day to grind low limits and turn a good profit. Because of some player accusing them of being a bot, their accounts were frozen for the past month and a half, and they lost out on all of that potential profit. However, Full Tilt completely exonerated all accounts associated with full_tilting of any wrong doing.

Again, they're not bots or anything illegal against Full Tilt's terms and conditions. They are simply dedicated grinders who have developed a preflop and postflop style, and never deviate from it unless they have to adjust. They hammer new players and adjust for the regulars.

Now you know why they play so similarly; they play exactly the same. Chuck is a good guy, and to be honest, doesn't even know how to configure his virus protection; I had to do it for him. They play next to each other for motivation and chop up profits to reduce variance. Coming in every day, grinding, and sharing in the highs and lows makes it an enjoyable experience for them and is why they're able to grind for so long every day. It's a couple friends just shooting the shtt and putting a jihad on the 200nl tables.

tl;dr: They're not bots and they are acting within Full Tilt's terms and conditions.

-nation
This seems plausible to me. He's posted a follow-up that's convincing as well.