Nah, they tend to go from open source to closed source, or partially closed source with licenses that mandate the use of Chinese software or that the user follow Chinese law. Look at the WPS office license for Linux - can only be installed on distor’s originating in china, or Deepin that went from a non GPL open source license to a full on EULA last year, one that went full M$… well, they did back down with the free release’s EULA after the western FOSS community reacted badly to it.
Basically, after the introduction of the social credit score, a few high profile Chinese projects changed, suddenly they weren’t MIT or GPL3, or some other open source license but private licenses that had some pro china stipulation in the license, not all, and not at the same time.
China has a large population, it doesn’t matter if the percentage of programmers is smaller or larger then it is in other countries - they have a lot of good programmers. Unfortunately things like the social score and the the draconic surveillance legislation in China make non opensource Chinese software be looked upon with suspicion.
Currently HyperMD is free, open source and under an MIT license. I just hope these things won’t get changed in the near future with a new license that’s no longer opensource and which dictates that the software can’t be used in any way that would violate Chinese laws, or only in conjunction with other China originating software. It has happened before and it might happen again.
EDIT: currently HyperMD looks like the perfect engine to rebuild Joplin around. I just don’t know if anything changes with the license if anyone would actually fork the project and keep it alive and up to date - which is sad, because I really like the HyperMD functionality