[schipplock]

You can register an account for free. You don't need to provide anything when registering an account, just choose an E-Mail and a password. Is that what you mean with "privacy preserving"?

[schappim]

It is a core part of their marketing: https://tutanota.com/privacy

I guess marketing works on everyone, even online-fraudsters ;-)

[ridgered4]

Not through a VPN service though, at least in my experience.