You can't impersonate Google. Sites check the source IP and they don't overlap with Google Cloud.
Google isn't the only search engine in the world of course. It probably is pretty much the only one that matters in America but the world is not just America either.
You can for sites that can't afford the cost of keeping up-to-date with the Google IP list without which they can lose timely indexing. That is many.
Google isn't the only search engine in the world of course. It probably is pretty much the only one that matters in America but the world is not just America either.