It's not just about licenses. Fake chips, as Lego bricks with pins, do exist (seen them decades ago on cheap PC mainboards), but there also are grey areas made of discarded lots that didn't pass testing, lower specs parts relabeled as higher ones, for example consumer rated parts rebadged as industrial if not military, etc. Those are harder to spot, unless they're tested almost one by one. That would be unsustainable save maybe for the military.
