As always, the paying user has the worst experience. “Purchase” a show, can only watch on a certain console of a certain brand, no transfers, no backups, then it suddenly disappears from the library and nothing can be done.
If media companies insist on draconian DRM, then they should pay for full refunds to their loyal customers when one day they decide to delist that specific show.
No, backing it up is your obligation.
A digital purchase means they owe you access, in the format your purchased, as long as they exist. Nothing short of that can possibly be acceptable if there is any copy protection at all.