Summary: in China, cartography is illegal without approval and a license. The maps that do exist are deliberately wrong. They are obfuscated by technical means, and therefore, by design, there are no accurate extant maps of China.
Maps in China are required to be obfuscated, but the deobfuscation procedure is by now public knowledge (e.g. the Wikipedia article you link to includes it) so there is no shortage of accurate maps. Of course OpenStreetMap never bothered to comply with such restrictions in the first place.
Summary: in China, cartography is illegal without approval and a license. The maps that do exist are deliberately wrong. They are obfuscated by technical means, and therefore, by design, there are no accurate extant maps of China.
https://en.wikipedia.org/wiki/Restrictions_on_geographic_dat...
For comparison: even South Korea! https://en.wikipedia.org/wiki/Restrictions_on_geographic_dat...