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OpenAI transcribed over a million hours of YouTube videos to train GPT-4
(www.theverge.com)
This is a most excellent place for technology news and articles.
I do feel there's got to be nuance of a commercial company doing this to generate profit in the long-run versus end-users doing this just so they can see content more easily.
The uploaders on YT are paid per ad view. Seeing the content more easily means pretty much demonetizing small creators.