I expect eventually that with the rising tide of machine learning solutions being developed, someone will figure out that the chunky coarse-grained predictions

I expect eventually that with the rising tide of machine learning solutions being developed, someone will figure out that the chunky coarse-grained predictions and latency-filled transactions between user and server is monumentally inferior to a segmented approach which leaves the vast majority of user preference information on the clientside and which performs last-step filtering on the client device. No company can afford to throw the equivalent of a smartphone in processing power (plus what is necessary to make up for the latency) at each and every single users query, so purely server-side solutions will always be worse. Some day, someone will deploy a hybrid and it'll be faster and slicker than anything the companies desperately pimping their customers personal data can manage. And they'll sell it as a 99 cent app, not a subscription service or an indentured servitude "free" contract. And then, maybe things will change a little.