So this is the story that places like Reddit and Quora would like to tell. They'd like to say that they have this treasure trove of data which can be used to train the models of the future, but that doesn't seem to be what most experts actually beleive.

Firstly, Reddit is closing the stable door after the horse has bolted- they were open enough for long enough for most serious players to have most of that data.

Second, LLMs are poisoning the well. Reddit's content isn't going to be good training data if it is itself the output of LLMs and that is going to happen.

But finally and most importantly, it's not good! The open internet isn't great to train LLMs. A really important basic element of creating good models is training them on good data, and data from reddit as a source is terrible! Reddit as a source is about on par with just scraping the open web. If training data does become valuable you should be looking at places like the New York Times or scientific journals - places that have large volumes of quality training data.