My guess would be that they amplify tweets involving Grok as a form of advertising. I think they disabled tagging Grok for non paying users, so I guess they do it to advertise its capabilities. And because their user base is so toxic that mostly means amplifying things like that.

This is a command to the Grok bot and used to generate an image based on the post and that specific prompt. After significant outrage they disabled it for non-paying users at least, not sure if they changed more about this later.

If the "algorithm" thinks that I want to see <command to the Grok bot> from random accounts so jams lots of them into my feed then it is a pretty dumb algorithm

Maybe X thinks X users might be unaware of the ability to pay money to see other random X users naked, so it's basically an advert for non-consensual sexual image generation.

I've been saying that about a lot of algorithms for a while now, but I think the issue is more that they're smart algorithms optimized for the wrong thing