A bot can easily be exploited, all you need to do is emulate conditions to where it will sell and buy, if you had enough btc you could probably just take their coins in under 5 min, assuming no safeguards were in place like a max BTCn/hr max out.
No, no, no! You can trick a bot with a convex strategy (chasing momentum, for example). You can't trick a bot with a concave strategy (rebalancing, for example).