How many 'bots'/fake content is there on Reddit?

For context, I'm using Reddit more after having used Twitter primarily for years. It got tiring to see a lot of fake/bait tweets that were basically only there for engagement or to get that blue check money.

Reddit seems to be better, but depending on the post I see a lot of comments accusing stuff to be either a bot or made-up for karma (saying something like "oh this is so obviously fake, look at their comment history" but I couldn't see anything suspicious about it?). Or implying that the account will be shifted to being about promoting something once it reaches a decent amount of karma.

My question is: how common is this? Is there a bot problem on Reddit too? How can I tell if someone's a bot rather than a new user without much karma?