The first mistake
... was to announce that this was a 'bot and that people could "teach" it things. They might as well have put a "kick me" sign on it.
Hopefully, the next time MS do this, there won't be any announcements, no "Hi, I'm a bot" hoopla. Just an anonymous "person" joins Twitter and starts saying "normal" things - if anyone on Twitter actually says normal things.
So, the first lesson in machine learning would be to not tell the world that you're a machine. If the people who interact with it don't twig that fact then maybe you've got something interesting going on¹. Plus, of course, Twitter could really use all the new 'bots to boost its flagging membership.
I wonder what will happen when it becomes mostly bots? Will there start to be something worthwhile on it (at last).
[1] but more probably that its followers are even dimmer than the bot is.