[pygorex]

This is developer sloppiness. Google provides plenty of methods to authenticate users without persisting user credentials to disk. There's no reason an application would need to store your Google login to disk, unencrypted or otherwise.

[archivator]

As someone on Reddit pointed out, the minimal API version of the app is 4, which corresponds to Android 1.6, which, incidentally, does not have the AccountManager infrastructure.

I guess that's a good reason to implement credentials storage, don't you?

P.S. AccountManager stores your passwords and tokens unencrypted in a database as well.