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It should fairly simple for MS to block this API (if they wish to).

Why would they? They make money with ads too

But Googles makes way more, will make compete with Google even harder in the future (deeper pockets).

depends how the api is designed. If it'll be integrated deep into chromium, disabling it would cost too much time

I don't think so. Even if it's impossible to exclude it from the builds, they can just remove it from the JavaScript global scope or something.