All of my applications (including but not limited to “TempoMatch”) do not collect or use any user information.
If you have configured your iOS device to send analytics to Apple, the developer may see application crash and usage statistics.
There is no other information collected through any media whatsoever.
Therefore, there is no data to sell. If in the future there is data collected, it will only ever be used to drive product management decisions. No data will ever be sold or shared with any third parties.