Probably because you could sign up with a burner phone and then use it on a different device. As the code is open source it should be possible to determine if there is any way for the app to collect dangerously tracable information about the actual device it is being used on such as it's phone number or EMEI number.

Probably because you could sign up with a burner phone and then use it on a different device. As the code is open source it should be possible to determine if there is any way for the app to collect dangerous information about the actual device it is being used on such as the actual phone number or the EMEI number.