>You don't achieve anything by asking "why should I trust them?" They didn't ask that. They said "Why should I use an email address to log into the system?" (

>You don't achieve anything by asking "why should I trust them?" They didn't ask that. They said "Why should I use an email address to log into the system?" (rhetorical) and then gave an example of a service that also needs to verify the user has paid for the service (VPN), but does so without requiring accounts/in a more privacy-preserving way (Mullvad).