You can lose access to disposable e-mail , and e-mail is often necessary for specific requests—especially when we need to verify your identity to ensure that no one is pretending to be you. Regarding your privacy, you can easily create an anonymous email address; this should not pose any issues.
Username and password is enough for identification. Look for other anonymous crypto services like AgoraDesk and Stealths: they don't require e-mail.It is not so easy to create anonymous non-disposable e-mail: the user have to solve multiple captchas and in many cases pay for disposable phone number to receive SMS.