I’ve been seeing these posts in various communities for at least a couple weeks. I’ve seen some communities ban the user, but then a different user starts doing it. No idea what’s going on or what the point is.

For those that haven’t seen these posts and want to watch for them (if just for curiosity), sort by “New” occasionally. They get downvoted and/or deleted by mods pretty quickly, so they’re not likely to show up in most other sorts.