A bot post’s a picture to “super cool t-shirt my friend/co-worker/sibling was wearing”, then other bot comments asking for a link to the super cool t-shirt, then original bot (or yet another bot) comments the link to the site. It’s basically an advertisement, but with extra steps to make it more natural; AKA, social engineering and they are scumbags that see all somewhat popular online spaces as a place to shove their advertisements into.
We all get older, we just don’t all get grown.