I feel the lack of (public?) karma will at least help with the repost bots here. That is, if you buy the "bots needing karma to look legit" or the "needs to gather karma to post in some subs" arguments. I've always found those to be very weird as no sub I've seen needs several thousand karma to post and most bots still look like bots.

Competition for karma sounds like more of the same problem with bots: lots of low effort posts to rise those numbers