I'll keep it simple, Touch Typer does not collect, use, or sell your data.
It does use some third party services to monitor app health and usage. If you have any concerns or questions you can contact me at firstname.lastname@example.org
Touch Typer uses Fathom Analytics to track metrics including number of active users and their current country. This is used exclusively to monitor app stability and use. You can read their policy on their website. To disable Fathom you can find that option in the settings panel.