im not sure about allowed. perhaps required may be closer.

why would someone include tech that makes people think twice about using the app, unless it is required if you want to "sell" in a particular venue.

if your developing geolocation based apps, location tracking is a core function.

a calender, absolutely does not require location tracking beyond what side of the prime meridian are you on.

> if your developing geolocation based apps, location tracking is a core function.

But the subsequent sale of that data is not—is the discussion here.