I might be mistaken, but I think on Android you (as an app developer) can’t just launch things in specific other apps, and you can instead only launch a type of action but the user would be prompted to select an app to complete the action with (until the user chooses the default app for that type of action from that app).
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None for the time being, and I don’t know what I should use if I were to need one. I already use Proton for email so it wouldn’t be my first choice to give even more data to one company, even if they still seem good (though their marketing is relatively aggressive, which feels offputting).
“Just don’t be logged in” is not gonna be enough, if the device is the same as you normally use and you haven’t taken extra steps to make sure the device isn’t identifiable. I’d recommend doing this from a public library computer or similar public device.
I’m pretty sure apps can’t start until the user chooses to launch them, so in that time you could either disable the permission or turn off your device’s internet. Assuming you need a VPN so you can’t just use NetGuard?