I mentioned specifically Toyota because they have a lead in hydrogen technology. They refused to join the EV bandwagon for a long time. They were the first to bring hybrid in the market. And at this moment only Toyota has technology of hydrogen combustion engine.
Hydrogen IC is a big deal because of the way hydrogen reacts. It will corrode any traditional engine part very easily. So you need to design a new engine from scratch. Plus you also need to find metallic composition which will not corrode because of hydrogen.
Fuel cell technology exist 100+ years at this point so it is not a big deal. Every auto company on planet earth knows how to make a fuel cell and Tata hydrogen/ Leyland hydrogen are based on fuel cell.
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