"Not trusting" in this case is more of an operational than moral/ethical judgement, and more general than Google - you can't rely on privacy from any company if

"Not trusting" in this case is more of an operational than moral/ethical judgement, and more general than Google - you can't rely on privacy from any company if the government can send them a letter saying, "Gimme everything on this guy, bitches." And, well, if you don't want to run to Hong Kong, you're pretty much the government's bitch in that circumstance...