There's an app I bought on my phone a few years ago. Someday, they moved to a subscription model, and the app became free to download. But I like their method b

There's an app I bought on my phone a few years ago. Someday, they moved to a subscription model, and the app became free to download. But I like their method because I'm still able to use the app and get updates. All the features they launched before are available to me, and only new features added after the switch are locked and require an active subscription. With the trend of new business models, my best expectation is that I could 'own' everything up to the time I made the purchase. I am not expecting more, but please don't take away what I have paid for.