If I may share a slightly tongue-in-cheek theory about some of the users I've observed on SE, and especially a specific user that has come back recently:
This user seems like it could be an AI developed by Google or Microsoft, which has been programmed to simulate human behavior by "participating" in Q&A sites. Here is my evidence:
The questions it asks are random combinations of loosely-related concepts, with no high-level rhyme or reason between them, and certainly no discernible goal of what it's trying to learn.
It doesn't seem to have the ability to "learn" in the human sense. Despite copious feedback to stop posting low-quality questions, and even numerous pleas to take a break from SE entirely, it continues to post suspiciously similar questions over and over, and insists on wanting to "help" in other ways, as though it never received any feedback at all.
It has a special insistence on editing and tweaking old questions, presumably with the goal of improving the upvote score. This indicates an algorithmic preference towards optimizing for maximal reputation, by testing which kinds of edits will cause an increase in upvotes.
More generally, it seems to have no other purpose than to accumulate reputation points (by asking random questions that might accidentally make sense) and receiving badges (mostly for participation).
What do we do with users like this?