There was a time when Tidal was the only streaming service where you could listen to Prince's music, but now you can hear his music literally anywhere, including the inside of a bum's asshole—which, if it were a real streaming service, would probably be the fourth most popular, ahead of Tidal.
Additionally, for a fee, you can tour Prince's Paisley Park compound, where many of his lesser works were recorded, and take selfies in front of the elevator where he was found dead. For an extra $15, they'll probably even let you fuck on his bed, as if it were the Lincoln Bedroom.
No but really, whoever's in charge of Prince's estate is trying to get as much money out of it as they possibly can, and that might be why they're trying to get out of a deal that had been struck with Tidal.
There's a new (but not really new, duh) Prince album coming out later this year, and I guess it was going to be a Tidal exclusive, but Prince's umpteen siblings recently argued in court that it shouldn't be, since it's been revealed that the service faked streaming numbers for Beyoncé and Kanye albums.
Then there's the fact that hardly anyone uses Tidal. That Jay and Beyoncé album was a Tidal exclusive for like a day, presumably because if it remained exclusive any longer almost no one would have heard it. What good could a one-day exclusive (on a Sunday, no less) have done them?