from what i glean, apple is interested in the exclusive content, specifically the ability to sell digital downloads and video clips, which is where the real money is. the paid music subscription business, as i understand it, is a big money loser (even spotify isn't making a profit). i do think apple, which targets premium users who want the latest-and-greatest, could substantially increase tidal's premium subscriber base (reportedly only 1.5m pay for the hifi streaming) through product tie-ins and promos; conceivably owning the tidal platform could increase demand for apple devices esp. if apple makes it exclusive to ios. what does appear obvious is that tidal is unlikely to continue as a standalone company; it's been variously rumored that samsung and twitter were looking to purchase.