Why no ad free paid version? – Solitaire - Relaxing klondike Review

I really like this Version of Klondike. I particularly enjoyed the daily challenge game. I would gladly pay for it but I can’t find an option to do that within the app. The game is very relaxing but the ads for game I’m not interested in our very jarring.
Review by A Reading Teacher on Solitaire - Relaxing klondike.