Do note that their backing bank is greendot. If you sign up with a custom email address (eg: not gmail/yahoo/outlook/etc), your wealthfront account will still be created, but stopped from actually opening an account for failing verification.
As for verification goes, it's a black box from greendot's side[1].
[1] https://www.reddit.com/r/wealthfront/comments/11t7k56/wealth...