Google is your butler- the tension between utility and privacy

“Like a butler, you want your tools to work intelligently based
on context and history, and Google is without doubt one of those
tools- for many of us, the most important single tool in our
computing lives. The problem, of course, is that your butler has a
lot of incentives to keep your private information private. Surely
the butler can be bribed, but therefore you pay him well and treat
him like a human being, and you try to avoid these sorts of
problems. Google’s incentives run at least partially the other way-
they have strong incentives to mine that data extensively, to share
it with others, and to collect well more than most people might
think is useful, in the name of being the ultimate butler. And
these incentives lead to risks- incentives to share with third
parties that you might not trust; risks that things might be
subpoenaed; risks that they might leak to Google employees or even
outside Google; risks that effective advertising might use such
information to manipulate your political views.”

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