In case you didn’t know, you can’t train an AI on content generated by another AI because it causes distortion that reduces the quality of the output. It is also very difficult to filter out AI text from human text in a database. This phenomenon is known as AI collapse.
So if you were to start using AI to generate comments and posts on Reddit, their database would be less useful for training AI and therefore the company wouldn’t be able to sell it for that purpose.
If the goal of training is to produce output that users “like” or engage with, then yes, upvoted content is higher quality. The definition of quality here will certainly depend on their goals.
My point is a bunch of spammed content intended to poison AI training is unlikely to gather upvotes, and so it could easily be filtered out if they’re also okay with discarding some human generated content that was not upvoted.