Email and phone verification
Email verification is required to publish your site. Phone verification secures your account and is needed for some actions (e.g. short/personal subdomains).
Changing your email
You can change your account email; a verification link is sent to the new address. The new address is subject to the trusted-provider rules.
Closing your account
Account deletion is a multi-step flow; you're asked a short survey and to type a confirmation phrase (e.g. DELETE). Deletion is irreversible and your data is permanently removed.