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Because the company offering the terms is a monopoly on the Android marketplace.

...and in a duopoly on mobile app stores

If a Netflix competitor wanted to be a thing, they simply wouldn’t be able to because they wouldn’t get these deals.

you arent required to use stripe if you want to add billing to your app.

And you aren’t required to use In app purchases for subscription apps on either platform

You are obligated to not mention or link to purchases outside the app.