The future bots won't need followers. They will reach out to engage users based on their ad graph. Like how catfish accounts work.

They'll reach out to users and talk to them about whatever they're interested in. They'll then make influencer-style native advertisements. If you're a middle aged man that likes video games when you see their picture posts they'll be "wearing" some vintage game t-shirt (that's for sale). If you're instead a twenty year old woman into yoga the same bit will be "wearing" some new Lululemon yoga pants.

The first pass of these bots failed because they used the follower mechanism. The next version will just follow you to push ads or scrape more data about you.