Huawei pulled it out with HarmonyOS (I don't know how good/bad is it, and if it'll have staying power, but other companies are putting in the effort)
PS: btw, Samsung already had its own, non-Android OS with Bada (of course, developing a new OS is only the first step, getting it to be successful wouldn't be easy)
Bada lasted, what, 3 years? So it did better than Firefox OS (unless you want to count KaiOS as the same thing), but not by much? Not a great look I'd say. And things haven't gotten any easier during the past 15 years, with Apple and Google's positions being more entrenched than ever.
I don't like how Chinese companies systematically get reduced to "it's because the government can help them". The US TooBigTech get a ton of help from the US government, starting with political pressures when other countries want to regulate them.
Huawei have really good technology and very competent engineers. It's not the Chinese government that does the engineering.
DJI is years ahead of everybody else technologically, and that's again not the Chinese government doing the engineering. Let's stop believing that the US are superior in every single way and that someone else doing better means that they must be cheating.
Two things can be true. They can have great engineers and government money. Theyre not mutually exclusive.