There are no cookies, but there's local storage -- which is basically the same thing to the end user. Most of it is display or user preferences, but it has a password field which could track me across ip address changes (if I stay on the same device).
I don't know, though. None of this can be associated generally with name, phone number, address -- the basic stuff I usually consider personal data.
My goal would be similar, to never have someone fill in an e-mail, for example. Not that anyone cares, it's going to be a handful of people I already know at best. I'm going to have to do something different for password reset, probably provide a code. But it's something to try.