function my_remove_gforms_action() {

    if ( function_exists( 'wp_fusion' ) ) {

        remove_action( 'gform_user_registered', array( wp_fusion()->integrations->{'gravity-forms'}, 'user_registered' ), 10, 4 );

    }

}

add_action( 'wp_loaded', 'my_remove_gforms_action', 100 );