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> Except that 90% of Reddit isn't garbage. It's really useful.

Citation needed. I've been a Reddit user since its inception and honestly except for niche hobby subreddits, Reddit is mostly low effort garbage, bots and rehashed content. I'd wager that mainstream subreddits are 99% garbage for training an LLM for anything other than shitposting.

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Even in the niche hobby subreddits there can be a really high garbage factor. There's plenty of well meaning posters that are just wrong. They're not trying to mislead or lying they're just unaware they're wrong.

The good answers tend to use links as well, which won't capture well. In many political and local subreddits there's a huge amount of Russian and far right sock puppet activity. Good luck training an AI to understand political opinions or what people in an area are like when most of the longer comments are pre written copy pasted talking points from astro turf groups and bad actors.

Pretty much. There were some good information, and even book worthy ones. But they were the ones that bubble to the top in helpful and knowledgeable communities. The rest is junk.

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