You have at very least: * Mobile connection, a few carriers * Starlink/Eutelsat
It's not perfect, but nowhere near Google/Apple duopoly. Also this is very local US issue, solvable on city level regulation, while smartphones are everywhere.
Starlink in an apartment in the middle of Manhattan? Suggesting Eutelsat is just funny frankly.
You also have the option to move. I mean, that's not ideal, obviously you don't want to have people up and change addresses to deal with a problem with a single company, but if you end up on both Google and Apple's shitlists, there's nowhere you can go to where Schmapple is a third option.