Other commenters correctly pointed out that it's because of the TV deals which preclude home grown streaming services, but they seem to believe that once those

Other commenters correctly pointed out that it's because of the TV deals which preclude home grown streaming services, but they seem to believe that once those deals end the leagues will switch to their own streaming services. I'm not so sure. These TV deals have values in the billions. Will the owners really be willing to risk billions of dollars for the chance to make a few more billions? I know that I'd be happy to ride the gravy train as long as it's coming. Setting up their own services is risky. Most viewers aren't willing to pay extra for individual games or leagues, they want an entire sports package. People are slow to make changes. I'd expect leagues to lose huge amounts of money the first year or two if they created their own service while they try to sign people up. The most palatable way for sports to get into streaming seems like it'd be to team up with an existing streaming service, Amazon seems like the most likely contender here. But the problem with that is one of the biggest advantages of streaming sports is being able to have seamless gambling integration in the service. I'm not sure the big streamers would be interested in that.