> they could make having this app a legal requirement to go in any shop if they wanted If they can legally mandate an "app" they can mandate me having a device

> they could make having this app a legal requirement to go in any shop if they wanted If they can legally mandate an "app" they can mandate me having a device to run said "app". It'd be absolutely absurd to mandate you having a spy with you at all times to exist in society. "Sorry, don't have a phone, kthx", "Sorry, my phone doesn't use gapps, it's using a custom ROM", and what about these Linux phones? Yeah, that's not going to work.