The OSMF doesn’t block access to the OSM editing API on a country by country base. So I suppose the answer is that there is de facto support in China. I’m not sure if this is actually the API you should be using, but that is a different question.
Nobody here will be able to answer that definitely except authorities in China, further you shouldn’t be asking for legal advice on a public forum, that is what your legal counsel is for.
That depends on what you are actually doing, there is no real competitor to OSM in the open and free, user generated geo data market, there are naturally numerous proprietary services.
Nobody here will be able to answer that definitely except authorities in China, further you shouldn’t be asking for legal advice on a public forum, that is what your legal counsel is for.
Just thought there was a definitive answer, but I can get more legal advice about that.
The OSMF doesn’t block access to the OSM editing API on a country by country base. So I suppose the answer is that there is de facto support in China. I’m not sure if this is actually the API you should be using, but that is a different question.
(1) Simon is right that the OSMF runs no public Overpass servers, only an internal Overpass server that powers the query feature. Therefore there is no “Overpass API URL” for that one.
(2) If you build and distribute an app that relies on Overpass, do not use any of the public servers (as these can go away at any time, or block your app if you make too many requests). They’re also funded by donations so don’t exploit that for commercial gain. Instead, set up your own Overpass server.