If that were true, all the AI companies would have negative stock prices. Promises of (best case) future earnings are part of stock prices.

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.