The companies that aren't serious about them today are Toyota, Honda, and Stellantis.
The reason was simple. Most of the politically powerful Japanese companies are huge conglomerates who make a lot of money in heavy industry areas where until a few years ago hydrogen was an obviously better choice than electric powered motors, which meant that there was a lot of pressure on the Japanese govt to put pressure on the car industry to align in the same direction.
There is also the fact that both companies were early innovators in making gasoline engines much more efficient with things like (non plug-in) hybrid drivetrains, so they have an interest in pushing gas focused technology.
https://www.detroitnews.com/story/business/autos/ford/2022/0...