@martinko: Hi! Thank you for your questions. We understand your concern and the privacy of our users is of utmost importance to us. On all platforms, we use the OS tools to encrypt passwords that are stored on the device. That encryption is typically tied to the OS account. Moreover, Google has a requirement that we cannot save or allow access to passwords or payment information unless the user can block access to passwords using a profile lock.
You can read more about it here, from the official guidelines:
https://developer.android.com/docs/quality-guidelines/car-app-quality#SD-1