Why doesn't Google symbolically charge Android a patent fee?

Google didn't do Android at first. It is just an operating system written for digital cameras. Later, it was acquired by Google, and then a developer contest was held without spending a penny to collect programmers written by their own developers, and the Android operating system was born. To really count, Android is the product of all developers, and open source also inherits the spirit of linux. If he wants to charge, it is estimated that Sun will have to file a lawsuit with Google to charge. ....