How much money was Jay-Z's Tidal paying artists? I think music streaming is a low margin business that is only successful at a large scale. Why doesn't Paul Mc

How much money was Jay-Z's Tidal paying artists? I think music streaming is a low margin business that is only successful at a large scale. Why doesn't Paul McCartney, who's extremely wealthy, spin up a music app to stream his stuff and ask people to pay for it? Because he wouldn't make any money from after setting up the infrastructure, marketing it, paying people, etc...