Although the free period has passed now, Google does not charge. In fact, if it is a mobile phone system, it can't be charged. Now the system launched by domestic mobile phone companies is also Android, but the kernel is Android, and the system has changed beyond recognition. Google wants to charge, but there is nowhere to start.
Google doesn't charge for Android on a global scale, and his income mainly comes from a series of software. The promotion of software requires a lot of cost. Google's Android is equipped with his "Google Family Bucket" overseas, which gives Google an inherent advantage in the Internet field, which is why Google's "monopoly" in Europe was severely punished. The benefits of Google Android are in this respect, which is why Android does not charge overseas. Google's withdrawal from China made Android unprofitable in China. Google also occupied this operating system to avoid the rise of domestic operating systems.
Google withdrew from China because it refused to implement China's laws and regulations on the Internet, which made the whole Google family meaningless in China. It is not pre-installed, pre-installed and unusable, which makes Google not benefit from Android in China. But for Google, it is still hoped that enterprises in China will use the Android operating system, even if there is no charge. This is because the most important thing for an operating system is the establishment of its ecosystem. If Google forbids China to use it, the result is that China will produce a new operating system, which threatens Google's Android, which Google doesn't want to see. Therefore, Google would rather not charge, occupy a position or give other operating systems a chance.
Google has been trying to return to China, which is the direction of its efforts. In short, Google's Android will not benefit in China at present, but it is still willing to control the operating system in China, so as to avoid an operating system in China to compete with it. After all, only China and the United States can cultivate mature operating systems and complete ecosystems.