Way back in the PS3 Era, Sony had PlayStation Home. It was technically Free, but if you wanted to do anything but just walk around, you had to buy items - a virtual apartment, furniture, clothes, etc - all cost money. When they ended the atform and shut down the servers, they initially used the fine-print of the User Agreement to prevent users from requesting refunds, but they still got hit with a class action lawsuit and settled before the trial started. Granted, the settlement did not cover all funds spent, but compensation was made to anyone who spent money and submitted a request to the class settlement fund.
The point is, they might try to hide behind the extremely long, confusing UA, but as history has shown, that in itself is not a guaranteed. Either way, it will be interesting to see how it all unfolds.
And, in regards to everyone saying DVDs and BluRays mean you forever own that movie - do a bit of research. Disc's have a shelf life (10 years for DVD and 25 years for BluRay). That doesn't mean they stop working, but the data degrades over time, and the more you use them, the faster it degrades. That is why the move to digital and streaming initiall took off so quickly - while not perfect, there was no fear of the data degrading over time. And, once people start recognizing all the downfalls with the current digital streaming services, (not actually owning anything despite purchasing it, how companies can remove access rights at anytime without notice, corporate instability, and so on) there will be a push for a new service to replace it. It is a sad truth of the Technology and Information Age - Nothing is secure.