Because Taylor Swift is a force on the digital world, that's why her last tour was only released on Netflix. Madonna is not. Now, she can alwasy release it on Prime like Coldplay did, but they also released it on dvd/cd. Madonna's live cds are in her contract as I said, that's why they were released also ad stan alone albums since MDNA even if they're just a copy of the audio from the bluray/DVD.