A lot of comments here about AI, but if you actually looked at the source material you'd see that what is shown is a verbatim copy of a thread of user comments using new accounts. This is not an example of an LLM generating AI content, it's a blatant copy of human content with attribution removed.
I guess their license allows them to do this, but wow.
I don't know who is doing the reposting, but the only party that seems to benefit from that sort of thing would be reddit. Why would a 3rd party do that?
As other people mentioned above, karma farming for bot accounts. Reddit probably benefits as well, just like any other social network doesn't want to clamp down too hard on bot activity.
I guess their license allows them to do this, but wow.