Don't allow people to see a subscriber's profile tab.

prevent-profile-tab-access.php

add_action( 'bp_actions', function() {
  if ( ! bp_is_user() || is_super_admin() ) {
    return;
  }
  $user_meta = get_userdata( bp_displayed_user_id() );

  if ( in_array( 'subscriber', $user_meta->roles ) ) {
    bp_core_remove_nav_item( 'profile', 'members' )
  }
}, 1 );

this accomplished the blocking of profile page but still gives subscriber access to it's other pages like messages/ buddydrive.

add_action( 'wp', function() {
if ( bp_is_user_profile() ) {
$user_meta = get_userdata( bp_displayed_user_id() );

    if ( in_array( 'subscriber', $user_meta->roles ) ) {
        wp_redirect( home_url() );
        exit;
    }
}

}, 1 );