I see what you mean. But that's not a new problem caused by AI's, which I think was the original point.

I'm sure that all (useful) social media sites have a way to flag, or down vote such massive influxes.

Bot recognition of some sort of rate-limit transgression is another issue entirely, and not what I was trying to comment about (content based spam labelling based on "AI" authorship).

Perhaps I missed the point of the OP, in which case please ignore me ;-)