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It's probably more a commercial advantage rather than BB, although with that much data stored it's inevitable that someday it will (or has been) used for something more than aggregate statistical analysis.
I'm surprised they didn't use the google.com domain name (or a subdomain) so that people's google cookies would be presented when someone loads a site with google analytics on it. (Fetching from unrelated domain such as google-analytics.com will not send a*.google.com cookie)
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