registration wall

By analogy with paywall.

registration wall (plural registration walls)

1. (computing) A feature of a website, application or service that only allows access to certain content or functions to users who have registered by creating an account.
   • Dr. Rakesh D, Dr. Manoj Kumara N V, Dr. Darshan S, Marketing Management (page 164)

     This can be a good way to generate leads, but keep in mind that putting up a registration wall will likely reduce the amount of SEO traffic you can drive to that guide.