I, Mark Eschbach, am a single developer building out services for free or a small usage fee. I have better things to do with my time than aggregate your information for others. Generally, given my technical background and capabilities, your information will only be used internally amongst those who you chose to share it with and the operators of the system.
Unless otherwise specifically agreed upon in writing you only get the guarantees of a California, US citizen from a shop the size of 1. If that does not jive with your local jurisdiction then you must not use the system.
These use first and third party systems to build, operator, monitor, and maintain the systems. As a result some information is disclosed to other parties. For example the web user interface utilizes Google Analytics, the Android app uses Google Play Store, etc. If you are interested a larger list feel free to reach out to the address below and voice your specific exact concerns.
Please reach out to me at meschbach@gmail.com if you have questions, thoughts, or concerns. I try to respond as often as possible given a civil message.