I doubt they'll spring for the bandwidth and resources having their entire library always available requires. If their subscription count disappoints I could see new stuff not being added as fast or dropping old stuff off. to maximize profits.
Datacenter costs have gone up a fair bit recently. are they doing all of this in the house that J.T. and Britney built? If they have the money to do all of this the right way, in house, maybe.
Hopefully I'm wrong?
Even if I am, the next downturn when troves drop off will be a good first judge of how good the service is. (to me)
I'm confident the user agreement will allow them to do whatever the hell they want/ deem ideal.