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I would imagine it's China that's preventing Chinese users from visiting your site, not Google?

Yes, but the end result is the same

I guess, but if you go to the trouble of localising your website into Chinese, then loading a self-hosted version of the library for Chinese users doesn't seem like much extra work.

This can be solved through the use of a local fallback if the request to the Google CDN returns 404.

Needs 1 or more of:

Handling out-of-order js file loading

Duplicate loading prevention

A way to deal with a file that is timing out (holding up page load)

Ideally using async property for script tags

AFAIK most CDN versions of popular libs don't support what you need, so you might as well load locally...