I would bet that some devs could be persuaded by some governments, but I don’t suspect that any major company would do that without MAJOR benefits to themselves.
Which means, yes, it’s probably happened, and will again, and they were probably Chinese or Russian apps.
Depending on the country Yes.
Australia for example has the Technical Access and Assistance laws for this specific purpose.
Now, consider Australia is part of Five Eyes that means US, NZ, UK, and Canada has this capability via proxy.
They could probably go directly to the app platform like Apple Apple Store or Google Play Store, I think Apple and Google has the signing keys to forcibly push an update (correct me if I’m wrong, but I’m pretty sure that’s the case).
google does for sure. a few years ago they demanded all developers to hand in their keys in the pretense of efficiency
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