I don't think the threat model is comparable. Quote-mining is a problem for Google because it's an effective strategy between multinational companies wielding

I don't think the threat model is comparable. Quote-mining is a problem for Google because it's an effective strategy between multinational companies wielding a hundred lawyers. On the other hand, if the government decides I'm a terrorist, they will "take care of" me, and they don't need some stinking search log to justify their action.