https://thenextweb.com/apps/2019/10/23/heres-why-disney-may-not-work-on-your-phone/

Disney+ is set to launch next month with plenty of exciting titles at the offer. But you might not be able to stream all of them because of DRM (Digital Rights Management) constraints.

Streaming services use a special DRM called Widevine, which is owned by Google. It requires Android manufacturers to meet certain criteria for video processing and cryptography that will secure the content being streamed. While Widevine doesn’t require phone makers to pay a fee, they have to pass a test to acquire a certificate. Streaming apps such as Netflix will check for that certificate to stream HD content.