All you need to know is this:
All you need to know is this: every major auto manufacturer is working on hydrogen fuel cells. Toyota, Honda, GM, Hyundai.. all of them. They haven't done so with the force of government requiring them to build a car for compliance (CARB) nor for PR (HFCs usually get very little press compared to BEVs).
They're obviously doing it because they know that to be competitive a few years from now, they'll have to have the technology perfected.