There are ways to vastly increase the production and distribution of hydrogen fuel, but there has not yet been enough infrastructure developed.
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It takes a lot of energy to produce hydrogen as well. It doesn’t come out of thin air.
The cheapest method to produce hydrogen gas is the steam reformation process, where methane is reacted with high-temperature steam in the presence of a nickel catalyst (produces hydrogen and carbon monoxide) with a secondary reaction between the resultant carbon monoxide and steam over metal oxides (usually iron oxide) to yield carbon dioxide and hydrogen gas. Thanks to the global warming liars in government, the additional expense of carbon dioxide sequestration eats up revenue unnecessarily.