[judge2020]

When you are buying a phone, you also pay price that includes price for OS of the phone, that includes development costs of SDK and development tools.

With the race to the bottom on cheap Android phones, it's obvious that "profit from the device only" is insanely low.

> Some of the phones nowadays has a choice to BUY and install different OS, that comes with different stores.

Just pointing out that this seemingly directly contradicts your line before it. If some phones can install a different OS and come with a different store, why should the phone profit margin go towards developing the SDK and development tools?