Earlier quoted context omitted.
What motivation is there to use AI to astroturf (if that's what this is) like this? Is it ideological? Is it product marketing in those relevant threads where someone is showcasing? Or is it pure technical testing, playing around?
In some cases, it's probably to establish aged accounts that are more trusted by users and spam algorithms. There's a market for old Reddit accounts, for example.
Incidentally, how much do they pay for a HN account that is a few years old and accumulated a few thousand Internet points?
Asking for a friend.