I saw a post about someone making a “controversial” opinion (their words) about liking a game everybody fell in love with. It was a well-known, widely loved, and highly praised videogame that is very good (fires of rubicon). Then, a few hours later, after we called them out on it, they deleted the post.
Back in the day, if I saw some braindead karma farming post on Reddit, I took a look at their post history and quite a few times it was a brand new account. I would simply reply “Welcome to Reddit! How has your first [week/day/hour] been?”. I think precisely twice it turned out to be a new human user, the rest of the time they would just delete the comment (or possibly even the account).