If you can use 1kg of hydrogen to lift x>1kg of hydrogen using proton-proton fusion, you are getting exponential bulidup, limited only by “how many proton-proton reactors you can build in Solar system” and “how willing you are to actually build them”, and you can use exponential buildup to create all necessary infrastructure.
If you can use 1kg of hydrogen to lift x>1kg of hydrogen using proton-proton fusion, you are getting exponential bulidup, limited only by “how many proton-proton reactors you can build in Solar system” and “how willing you are to actually build them”, and you can use exponential buildup to create all necessary infrastructure.