We tried to set up a small startup of 3 people with the goal of offering a service for social bot detection, reporting and (eventually) removal. The assumption was that they are an annoyance and might be a danger to the public opinion and to brand reputation. We started on Twitter for our MVP.
We failed to generate interest in it and it turned out that social bots are actually mostly marketing tools by ad agencies to promote their customer's product. Their goal is to make a topic trending, so that real people start noticing it. There is a strong business case for social bots.
We should have created some Social bot toolkits, that would have probably worked much better...