No dude. Sure there are bots in twitch but chat bots are very rare and they are very easy to spot for a few reasons. Chat bots say completely irrelevant things and most of them have default name color & avatar, and on top of that a group of chatbots are registered on the same date. The only common bots in twitch are viewbots that just boost the viewercount, they don't chat for obvious reasons.
It's very hard (probably impossible) to program a bot that can chat continuosly in realtime without looking very out of place. Twitter bots are easy, they just need to send a prewritten spam tweet/etc