The incentives to create fake engagement to satisfy their actual users who want discussion are quite clear. Doing this also gives reddit an advantage when monetizing their data. Scrape posts & comments for free, and you won't know which are LLM-generated and which at least have a human in the loop (but the human still may use an LLM, so this is where fingerprinting comes in). Perfect for incentivising the ai labs / other consumers of reddit data to pay up for an official feed.