Google requires you to register an application and get it approved to log in with OAuth, you can't just use it with arbitrary callback URLs. Why should I need to ask Google permission to use my own data, or ask for Google's permission to allow other apps to use my data?
If the Beeper service is totally fine, and you mind their auth methodology, perhaps you should complain about Apple not providing better iMessage auth options.
Instead, you complain about users being able to give their own data to an app they chose to install.
> Google requires you to register an application and get it approved to log in with OAuth, you can't just use it with arbitrary callback URLs. Why should I need to ask Google permission to use my own data, or ask for Google's permission to allow other apps to use my data?
If the Beeper service is totally fine, and you mind their auth methodology, perhaps you should complain about Apple not providing better iMessage auth options.
Instead, you complain about users being able to give their own data to an app they chose to install.