It’s a reminder, one I think which needs repeating regularly, of the shift in how we define ownership in the always-online era. In this case it’s about books, but it’s the same with most of your digital purchases - we’re increasingly leasing our minor belongings, which I think means leasing aspects of our memories and even personalities too.https://www.bbc.co.uk/news/technology-47810367
If you can't download it, you don't own it. If it's not in an openly documented format, you don't own it. If it requires a proprietary application, or proprietary code to read/watch/listen/view, you don't own it.
Credit to Microsoft for recognizing this and refunding the books in this case. Still it does not solve the underlying problem with the model. Only we as consumers can change that, so I guess it's safe to assume there will be no change.