I've owned more than 30 ICE in my life and I never owned a gas station. I could not even fill the tank at home.
"With the range of a Tesla, there shouldn't be a need to use these Volta stations if you have firm charging options." You answered your own question. They don't have firm charging options.
You own a Tesla and you criticize or envy other Tesla owners for charging in the wild? Wow !
Something else I’ll point out is that as EV/Teslas become a favorite at rental car companies, yes tourism will return, those renting cars will need charging to tour the island.