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And what is the argument on making that knowledge accessible via LLMs vs directly? Why was it not accessible before?

its a radically different approach to knowledge search and exploration than the previous "direct" alternatives like search engines/indexes/nlp

The search engine wasn't the problem though, it was paywalling the information so less people had access to it.

How do for-profit models served by for-profit companies make information that was previously "pay to learn" more accessible?

LLM is an NLP approach.