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Unclear which LICENSE it is.

Apache 2.0

(Though with all Facebook's shenanigans I understand the need to be sceptical and search for a license when a company claims "open source")

And the finetuned models seems to be CC-BY-4.0 (note there are no NC). IBM actually not lying it seems unlike most of the other "open source" models.

ML models are not copyrightable and the licenses people choose to try to apply are irrelevant.

Yes, I actually type these by hand. My carping is 100 percent artisanal.