Remove an action created by a Gravity Forms add-on

Problem solved!

add_action('init', function () {
    $object = \GF_User_Registration::get_instance();
    remove_action('wp', [$object, 'maybe_activate_user']);
}, 20);

Thanks SallyCJ for the tips!

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)