Well, he only gets commission if the users actually make a (monthly) profit... if it's a loss, he gets nothing. So, theoretically at least, it is in the bot creators best interests to make sure that the bot works and generates profits.
If the bot person would refund 30% on losses - that would be a decent incentive. Otherwise he doesn't risk anything. And he certainly doesn't care about customer relations, so you can't say the incentive would be retention or anything like that.