Take a look at the app's requested permissions. This app does not connect to the internet and does not contain any ads or data collection methods. As such, no data is collected or sent anywhere. No user profiles are created or data stored anywhere else other than your device.
This app is a black box to its developers. No content or usage statistics are created or transmitted.
This app is fully open source and you can see the source code here: https://github.com/pherbers/BehindTheTablesApp
If you do want to be tracked or your data harvested, you can always install proprietary software.
This software is provided “as is” and any expressed or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. In no event shall the regents or contributors be liable for any direct, indirect, incidental, special, exemplary or consequential damages (including, but not limited to procurement of substitute goods or services; loss of use, data or profits; or business interruption) however caused and on any theory of liability, whether in contract, strict liability or tort (including negligence or otherwise) arising in any way out of the use of this software, even if advised of the possibiltiy of such damage.