Why is Gulp not opening a local address?

Question

gulp.js

I run gulp and instead of opening my local site, it opens a third party service, what could be the problem?

gulp.task('browser-sync', function() {
  browserSync({
    server: {
      baseDir: 'app'
    },
      notify: true, // Отключаем уведомления
      open: true, // Запретить открытие браузера в среде
      tunnel: false, // Создание тунеля для демонстрации
  });
});

In browserSync I specify a local folder, the host file is empty

Answer 1

And the folder is on the local server or desktop etc...?