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At least you got a refund. I lost count of the number of apps and games I purchased from the Google Play store that got unlisted / removed and I didn't get any refunds. Granted it's not Google removing the app but it's the developers unlisting it for whatever reason. A small heads up before said unlisting would have been nice.
It's Google's store policy that apps cannot be removed from a users library. If you purchase it, and the app later is delisted, head to manage apps. List apps not installed. I have stuff there from when I had a device that ran Android 5. I've never had an app disappear. They just eventually reach "can't be installed on this device."
It may be store policy but it unfortunately does not prevent it from happening. Two examples i can remember are "Gentle Alarm" and "Manhatten Project". Both I purchased and no longer available. Also not in my "not installed" list unfortunately.
I may have used the wrong terminology in my earlier reply. There is "unlisted" where the developer leaves the app in the store but removes it from the search. "Carcassonne" by Exocet comes to mind. It is still available for me to install but searching for it only shows the version by Asmodee.
Then there is the complete removal of the app. Gentle Alarm and Manhatten Project are 2 examples. :(
Then you should report the developers for breaching the Google Play Developer Policy.
I don't think they are around anymore.