There's a way to look at the top Karma users on Reddit. Most of them are either bots, or corporate account. There's a Marvel one that posts movie stuff, and some Turbo something or other for gaming. They don't comment, they just post what their corporate overlords want you to see, and they probably have bots that push their content to the top. They just aggregate popular sites, though, driving people into the ads.

When I was on Reddit, going to that leaderboard to block people was my first stop. Though, I do think there are a few that are interesting, even bots — like the haiku one is amusing. It doesn't always get it right, but it's fun to see it try. Then there's a guy — pretty sure it's a person, at least — who turns posts into poems. Not quite the same. Got a weird name. Regular Redditors know who they are. "Something for your something", I think. I don't block the fun ones. Just the corporate trash.