Saudi Arabia already is a top hydrogen exporter right now. Hydrogen is a dangerous, highly volatile gas thats very hard to contain and to transport. You make it transportable and safe by binding it to something that rounds off its nasty properties.. Hydrocarbons do that better than almost anything while retaining the property of combustion. Methane (not an export of SA) is nothing but ennobled hydrogen.
The world's biggest oil exporter has set its sights on also becoming the largest supplier of hydrogen.