> It's not a standard if it only works with one specific implementation.

IMO, that's sort of what a standard is, but the words is not strictly defined.

I think you are trying to argue that it's not open. The source is on github, and does accept contributions, but effectively Google controls who can commit to it. Depending on your definition of open, that's a valid argument.

You can load those libraries from other locations, but Google search results won't be able to cache it because of the privacy concerns I mentioned in my top level comment. It's not "valid", but the only consequence of the invalidity is no caching, and that consequence is unavoidable given the privacy constraint. It still shows up in search results.

The Google javascript library URL serves with no cookies, is publicly cacheable, and is an identical file to what you can build from source on github.