China has a very diverse mix of technology. They use x86, ARM, MIPS, RISC-V and others. I don't know if splitting the efforts in many different directions makes sense.
China is a huge country with a much bigger hardware industry than the US. Seems to me it's normal not everyone there is working with the same technology. It's just a massive number of different companies doing different things.
That being said, RISC-V is gaining a lot of traction. I wouldn't be surprised if it starts to become a real challenge to ARM in the next five years. You just need mature tooling and better cores. Probably also need a wider variety of smaller cores for embedded applications available at the right price points.
I was more talking about the government though, which isn't otherwise famous for it's love of openness. I'm not aware of any government currently promoting FOSS/FOSH as much as China's is.
[1] https://www.bosc.ac.cn/yjyjs