I am not sure if you completely understand that Android phones in China use AOS or Android Open Source, which is a generic Android but without GMS or Google Mobile Services. This is truly open Android. Another example of AOS is the Amazon Fire Tablet in the US. This is generic Android but with Amazon apps and an Amazon app store. Android Open Source itself is free and is part of legal obligation of using open source software, as Android is based on Linux. The thing is, the current Chinese AOS already does what you hope HarmonyOS would do, and open source isn't subject to sanction. Open source is open source, and it means it is given free to the world to use. You don't need to have a license to use AOS.
Sure, HarmonyOS can become an alternative platform, but other Chinese smartphone makers like the BBK brands (Oppo, Vivo, OnePlus, RealMe), Xiaomi, ZTE Nubia, Meizu are fierce competitors to Huawei and don't necessarily trust Huawei either. They view Huawei and Harmony OS as an attempt to create a Chinese version of a closed Apple type ecosystem like iPhone and iOS where there hardware and the software are tightly integrated together, and isn't open to licensing like Microsoft Windows or Google Android. This would require the government and the Chinese telecom companies to step in to forge a neutral operating system standard that guarantees and protects the rights of the licensees.
I do understand.
I did mention HarmonyOS has to be separated from Huawei.
And at this point, it is is Huawei's interest to do so.