Replied to a tweet by Christopher Tomlinson (Twitter)

Have a following problem: lots of bot responses (more than 20 per hour for just one post)
Curious: what for do they do it?#curious #indieweb #bots https://t.co/WMfaHIZSh7
— Christopher Tomlinson (@Christo37433424) October 11, 2018

I suspect I’m missing some context, but taking a stab: the bots are hoping you’ll accept/approve their replies so that you put their links on your page for future clicks as well as SEO purposes. Like most spam operations, they just need an ~2% response rate to make the few cents that make doing this worthwhile. I personally blacklist some of the worst offenders by domain name, IP address, or judicious keywords.