Re: Coronavirus
iOS and Android APIs have to be baked into the operating system itself (or a modular component of it for Android).
Both Google and Apple have rolled it out to pretty much every single phone they support. Apple tend to support phones for a long time so they just added it to iOS 13 which goes back to 6S in 2015. Google usually don't but rolled it back to as far as I guess was technically feasible for them which is Android 6.
That is pretty far back for software on phones. If someone else tried to go further back, or even as far back as Apple/Google did, there is no assurance they wouldn't have had access to the functionality they needed in such old phones. In fact we know Apple don't let you have whatever location or background privileges you want now.
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