There is the other side of this too: Real people - fake posts.
So, you have other folks on here already saying that the code their bots write is better than their own, right?
How long until someone who is karma focused just uses a bot to write their comments and post their threads? I mean, it's probably already happening, right? Just like a bot doing your homework for you, but with somehow even less stakes. I imagine that non native speakers will take their posts and go to an AI to help clean them up, at the very least. At the worst, I can imagine a person having a bot interact fully under their name.
So even if we have some draconian system of verification, we will still have some non-zero percentage of bot spam. My out-of-my-butt guess is somewhere near 40%.