BuddyPress.org

This is the kind of thing I’d do:

add_action( 'init', function() {
    // Bail if the user is logged in.
    if ( is_user_logged_in() ) {
        return;
    }

    // Check if the listing page is being viewed here.

    // Redirect somewhere.
    bp_core_redirect( bp_get_root_domain() );
} );