Most other data capture and reporting systems consume your data and never let you have it back. There is usually no technical reason for this - the motivation is not only to capture your data but also to capture you!
We at PocketSurvey believe that this is unethical. ALL data produced and used by PocketSurvey systems are available in commonly used standard formats, e.g. CSV and XML, allowing you to migrate and use other systems when you decide - not us.