It's both parties. The button says 'buy' not 'hire for N years until the contract runs out.'
The implied transaction for consumers was that they had 'purchased' a product and retained it indefinitely. If Sony can no longer uphold their end of the deal, then they should be refunding.
I don't have a house big enough to store a ton of DVDs, and the Playstation Digital Edition solidified that we don't have to buy physical media anymore. So the only option is piracy.
If it uses a pruned model, it would be difficult to give anything better than a percentage based on size and neurons pruned.
If I'm right in my semi-educated guess below, then technically all the training data is recallable to some degree, but it's also practically luck-based without having an almost actually infinite data set of how neuron weightings are increased/decreased based on input.
If you're buying a license to stream 'until x time' then Sony should make that really fucking clear to the consumer.