Apple carved out a special ‘reader apps’ category for Netflix and other providers to bypass the standard restrictions of needing to implement all digital payment in-app.

https://www.fastcompany.com/90519293/the-surprisingly-simple...

While looking for it, I also stumbled upon the special deal Amazon has with Apple allowing them to only pay 15%: https://9to5mac.com/2020/07/30/apple-developers-equally/