I've seen mentors kicked from the novice network because their bot-kicking is spamming the channel (and, on occasion, a genuine sprout has admitted to being intimidated by all the kicking going on), so be careful if you plan on kicking bots. Also, as has been stated, they come back in 30 min whether they want to or not - and honestly, I doubt the bots care; they don't advertise or speak at all. That they're in the channel at all is less likely to be a RMT ploy, and far more likely the actions of a trolling Mentor (as has already beens stated in this thread).

While it's true that kicking them may well bring them to the attention of the RMT task force, I'd wager that the RMT task force has bigger fish to fry. They likely already know about them, but ignore them because new level 1 bots can be deployed FAR faster than the task force can ban them. They tend to wait until the RMT have leveled them a while, both so that the bots' time is wasted, and also so they can track where the bots are sending the gil they earned along the way.

Channel clutter isn't a big deal, since the bots never speak, and the channel has room for over four hundred sprouts. At the very worst, I've never seen the number of bots in channel exceed sixty. Perhaps it's worse on some servers, and there really ARE 400+ bots in channel at once - but I doubt it.

tl;dr: Kicking bots from Novice chat is pointless; it doesn't harm the bots, it doesn't tell the task force anything they don't already know, and it may frighten the genuine newbies.