Comment by troupo

> But someone has to pay for the costs of developing the SDKs and the platform.

This is included in the price of the hardware that their customers and all the developers who develop for the platform have bought, many times over.

Don't believe me? Look up Apple's financial statements and compare iPhone sales to the measly amount they spend on R&D (which includes the development of SDKs for all their platforms).

It used to be that Apple charged for MacOS. And then they said: nope, our hardware pays for that. And made it free.