I'd say this social contract which got "broken" never existed in the first place.

Even before AI we heard lots of complaints like "I made a popular open source library which is now used by corps with trillion-dollar market cap and I don't get anything out of it; halp". There was always some kind of a conflict, now the nature of the conflict just changed

If they made it MIT, they explicitly disavowed the GPL social contract.

If by “nature“ you mean the scale, which has expanded by orders of magnitude and functionally changes the problem.