No TV shows, but some remarks about books.
For Kindle I use the remarkable Apprentice Alf’s Tools to remove DRM from the books I buy and keep a local copy. It is unlikely that Kindle will go pear-shaped, but you never know …
I had a few Kobo books, but there was no similar tool that I was aware of.
Spotify, for me, is solely a streaming service. I have all my old CDs ripped to FLAC and backed up on a couple of external hard drives (plus the CDs themselves thrown in a suitcase!) but have never touched them in about 4 years because Spotify is so well done and convenient.