Voice in a Can was created by Atadore, a Swiss company.
Atadore does not collect or store any data on its servers when you use the app. Nor does the app use third party services for analytics, advertising etc.
This app DOES send your voice data to Amazon’s servers to provide Alexa functionality, and will connect to non-Amazon servers in order to provide services at your direction, such as playing flash briefings. The Alexa privacy page is here
In brief, this app does not send data to Atadore’s servers, nor to services other than Amazon’s.