First of all, never use comments for replies. Apparently they don't trigger notifications, for people who use them. But they also don't get noticed at all.
WGS 84 is a large and complex standard, among many similar large and complex standards designed for dealing with coordinates on the earth.
However, because WGS 84 is such a broad standard, it isn't going to have much practical meaning in more specific contexts like a map display. When it does have a specific meaning, it will typically have some kind of qualifier. It is usually better to refer to EPGS identifiers.
Apple Maps is a good example. The Apple Maps display uses EPGS:3857, AKA "WGS 84 / Pseudo-Mercator". But most government and professional mapping systems like ArcGIS use EPGS:4326, AKA "WGS 84". You can easily see the difference between these two systems in an image or map.
The above references to CLLocationCoordinate2d using WGS 84 is also true, but the significance there is related more to where a particular lat/long coordinate is on the earth, rather than the overall map display.
However, I don't know which interpretation is relevant for this question regarding China. China itself doesn't use WGS 84 or the EPGS system. They have their own, proprietary system that purposefully obfuscates locations on the map. China is very strict about mapping. They don't allow foreign companies, like Apple, to display maps in China. That's why Apple has to use Amap.
Why does any of this matter? What is the OP trying to determine with question #1? Is question #2 even legal? I can't answer either and I recommend just ignoring these literal "edge" cases.
If someone has a more specific need that seems like it would be 1) worth digging into and 2) legal, then maybe add a new reply instead of a comment.