I don’t understand why Google didn’t just made Android closed source. They would’ve made custom roms impossible and therefore more able to control and spy on it’s users. Why did Google made Android open source, while Microsoft’s Windows is still closed source to this day?
Android, Windows and macos all have different ways to make money.
Windows: sell windows as a product. Mac: sell hardware Android: use Google services too gain data and sell ads. Try to make the os as widly spread as possible.