Whose law? Your country? My country? The USA, just because? North Korea because they have the most restrictive laws? All unworkable. Your country's law applies

Whose law? Your country? My country? The USA, just because? North Korea because they have the most restrictive laws? All unworkable. Your country's law applies to you, as you use the system, but not to the contracts themselves. If you contract for something illegal you can be tossed in your country's prisons but the contract can't be altered.