Why should Android pay Microsoft patent fees?

Android is developed based on linux, and Microsoft has a patent on linux! But most of the patent fees collected by Microsoft are service patents!

Apple doesn't support sd cards:

Microsoft's patents are basically service-supported patents. Not Unix itself.

take for example

Linux itself does not need patent authorization, but it needs devices to access the API port of WINDOWS through Linux.

Give Microsoft a patent fee.

Moreover, Apple is also an IOS system based on Unix, so why not give Microsoft a patent fee!

Because apple avoided API service support. The original Apple device IOS realized service support through API ports and MAC devices, so that Apple did not need to pay patent fees.

The external service support is SD card, which is why Apple has never adopted SD card!