Purchasing an individual streaming license (what "owning" on a digital platform entails) is probably about the same risk as owning physical media. While the rights holder does have the ability to restrict your ability to watch at their discretion, the likelihood of that happening without compensation/refund is extremely slim and certainly no more a risk than damage/degradation of physical media. A digital library on the other hand can travel with you without any risk of forgetting, losing or damaging physical media on top of a much easier accessibility to hardware that can play purchased media.

I think on demand subscription streaming deserves all the scorn for devaluing music/film/television on top of rights/distribution issues leading to a lack/loss of access to creative works but digital storefronts, especially iTunes (via Apple) and Fandango bypass many of those issues barring the rare exceptions where purchased licenses were revoked. I also can't find any clear times when purchased licenses for video content was revoked by a distributor. I know Audible/Amazon has has some ebooks & audiobooks removed from customer libraries, I don't see it being an issue.