I think blackmail/extortion would be a more realistic scenario. As you correctly stated disabling the Web History is probably a futile defense against law enfor

I think blackmail/extortion would be a more realistic scenario. As you correctly stated disabling the Web History is probably a futile defense against law enforcement agencies of western countries but think about all the dictatorships or otherwise strongly authoritarian regimes that are the norm for most of the world. As Google pulled from the Chinese market AFAIK they are probably not as receptive to warrants from there. Then there are also most of the African countries and many Asian countries with a high degree of corruption, low to no political freedom and/or freedom of speech. Not to forget the Arab countries where staying logged in while a third party has access to your PC and pulls up your long term search history and figures out that you are gay and you're stoned to death because of that.