I take privacy seriously.
Some weeks ago I launched Planny 1.6 which has a new Data & Privacy section included. Users are able to request a download of all stored date like projects, days, categories, tasks, comments and more. Users are also able to request to delete all their data stored in iCloud. To complete the list, they're also able to export their existing data (as far as compatible) to Reminders.
All this data on iCloud is never read by others or sold - and will never be! Just like ads - nobody wants ads!