Hello MJ-
Because Cloud WordPress is freely available to the public and is primarily designed as a development environment, you’re right that search engines are discouraged from indexing Cloud WordPress Sites.
There are a lot of reasons for this, but primarily for developers using Cloud WordPress it will prevent indexing duplicate content between your Cloud site and your production site.
Currently, you won’t be able to test real-world search engine indexing for sites hosted on Cloud WordPress, but you can still use SEO tools like BoldGrid Easy SEO and Yoast to optimize your content and on-page SEO.