Why? Their system is literally mined for its Q&A merit by search engines. If it was all very bad information, NYSE: RDDT would not exist.
Stock prices are based on earnings, not on factual accuracy of content.
In Reddits case the stock price is based on nobody noticing that most of the users fled. Now they have to AI translate Indian content into English (and vice-versa) to keep up the illusion that people still use it.
At some point this will drive away the remaining users and it will just be bots and Reddits machine translations of those bot posts. At that point AI companies will just be paying to train on machine translated versions of content they generated to begin with.