I'd like to add something on point number 1, which already very well said.
Wouldn't employing an AI to analyze and predict market movement based on forum's discussion mean it'll be more easy to create a hype or PnD? All a trash project need is creating a fake buzz by having a bounty asking the participants to create an enthusiastic post on the forum? Yes, it is against forum's rule to incentivize post, but as they're already here to scam and rugpulling people, I am very much sure they won't mind breaking that forum's rule as well.
The AI won't be able to determine if the discussion is organic or artificial, and voila, the clueless members of this forum get scammed and the scammers get an easier way to run with people's money.
Fake hype can partially be countered by stats of users such as merits, user with good amount of 'earned' merits, his opinion of high value. However, this kind of gets deep, one implemention asks for many measures, so much that it might no longer be feasible to implement in first place.