Because the Japanese government bet big on hydrogen and heavily subsidized the industry. Also, is there any evidence that hydrogen vehicles have short lifespan

Because the Japanese government bet big on hydrogen and heavily subsidized the industry. Also, is there any evidence that hydrogen vehicles have short lifespan or require expensive maintenance? I don't disagree about how undesirable they are based on fuel cost but its hard to suss out how much of that is just based on extremely low production.