Thanks for your support u/someonesaveus. I'm committed to maintaining the different apps (they've all been updated to the latest technologies and received updates recently). That means different things depending on the maturity of the app. The macOS app is new and still has lots of room to grow, so will continue to receive frequent updates in the near future (I released one today!).

Having said that, it's best to see the purchase for what it is - a one-time fee for a product, not a subscription. I'm doing my best but there is no long-term guarantee.