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Why is Google allowed to remove purchases from our Play Store accounts without telling us?
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
Not only that. If you buy an app, you are at the mercy of its creator. If they decide they want to fill it with ads and tracking, or switch to a subscription model, there's nothing you can do. You can't rollback updates, you can't install an older version from the play store. If they decide to remove it from the store, you won't be able to install it any more.
I had one of the flight tracker apps, used it to identify planes passing my work lunch room's window, and paid $5 for it to get it ad free. Then it went to subscription and made it's free tier time limited instead of ad supported, so now I don't use it. I can't use an old version as it doesn't work on newer versions of Android
Edit to add: It's worth learning how to side load apps. While on a driving holiday in Sicily I was told that it was vital to have the ZTL app so I could know what areas were closed to cars (zero traffic limit), but it was only available on the Italian play store, so I had to download the APK and install it that way
Story of pretty much every good app ever.