At least in the EU they will implement a verification system, meaning you only have to verify with the official government, and then you can use a anonymised token that gives the porn sites only the age.
It's not perfect, but it's far better than everything else suggested.
The only reason they dont share it with other apps, is because from a capitalist standing point, why the hell would you share information you want to sell?
Them being the only one having access to a billion peoples location data is why they are the richest company.
They very much do dell, and they very much share that data with the government they also pay a shitton of money in donations for ball rooms.