[dragonwriter]

If Meta stands to benefit from open source AI taking off, why are its models CC-BY-NC 4.0 instead of open source?

EDIT: On reflection, you can probably extend the content creation argument to say that noncommercial tools enabling that without enabling commercial competition, to the extent that some of the models will be integrated into Meta products, is the best of all worlds for Meta, so the basic argument works even without open source in the strict sense.