I don't understand this demand. Isn't the training data likely petabytes in size? You want that to be available? I imagine just the index (name,date,source) is a terabyte or two.

As the training data is every written thing they can get their hands on, right?

And wouldn't making that "open source" violate every license that the original data has? You can't release someone else's work.

Unless I have a misunderstanding?

Can you evolve binary like you can post train weights?

Hence the difference between open weights and open source.

But this is neither.