Digital Panopticon Update: Twitter has abolished email-only registrations.

You can sign up via Google, Apple, or a phone number, but this will allow anybody with your contact details to find your account.

If you enter an email address, you can only complete the sign up process by downloading the mobile app to verify your account. I do not know what this process entails.

X likely wants device fingerprints so they can track/deanonymize users.

A recent banwave of RW Twitter accounts coincided with this feature's implementation, meaning any respawns will have to register with phone number or mobile app.