Which in itself is annoying, IMO. It creates a whole separate set of problems. You need karma, so people post in karma-farming subs to get a few crumbs. Then you get auto-banned from a dozen of the top subreddits preemptively for farming.
Reddit hasn't been as overrun by bots yet, for the most part, although how long they can hold out I don't know.
The main subreddits will basically shadowban you until your account is aged and has more than X karma.