Turner must not be seeing the expected return on paying for a slice of those media rights.
Emerging (unorthodox) players like DAZN, AMZ, FB, Twitter all have demonstrated intent broadcasting live sports. I worked on it for the NFL Thurs night games on Twitter, MLB games on FB Live, and YouTube. These players also have way more disposable capital and can move quicker than traditional media outlets.
It would be interesting to see FB v AMZ v Netflix battle over CL rights in the U.S. market. They can certainly outbid Fox (Disney) if they wanted.