Things like Kindle Unlimited (which at least say they're subscriptions to content access) digital streaming and so many other services that let you "buy" things that you don't keep on your own device in your own chosen format are all bullshit waiting to happen if you like to really own your digital stuff. Same for Google's News service. At least in this case Google offered downloadable PDFs for some editions.
That so many people fall for this only to be later surprised is almost laughable. What should anyone assume less from so many companies that take hostility to users as nearly a default position?