If the "key issue is trust" then I suggest the discussion is already over. Don't Be Evil deserve no more trust than any other sizeable organisation. It's surely no longer even debatable that large institutions such as governments and corporations develop the behaviours of psychopaths, where, unless subject to indepdendent oversight , they become ever greedier and less moral in their decision-making and policy. Hasn't the planet witnessed this about a billion times during the course of human history?
The reason we have the separation of powers in modern western democracies, and the reason America's founding fathers insisted upon ironclad freedom of speech and freedom of the press among other things, is the simple knowledge that without checks and balances, governments go bad. (It is, after all, exactly why Trump and his GOP lickspittles are assaulting the press, abusing the judiciary, trying to ignore scientific truth etc).
The reason civilised free-market societies have regulation, especially consumer protection, is the hard-won knowledge that otherwise, corporations can and will say and do anything to score an extra buck at the expense of the customer. Go look at some Victorian-era adverts for such things as "dimple scoops" if you need examples of how horrible things can be. The behaviour of the tobacco industry, food manufacturers with respect to sugar and car manufacturers most recently over diesel cheating, demonstrates quite clearly that corporations in the pursuit of profit will revert to shockingly barbaric, amoral behaviour if allowed to.
Only a blindfolded idiot would "trust" Google. Google exists to pick your pocket, not do you any favours. It didn't break into WiFi networks and harvest data during its StreetView patrols (and then lie, lie and lie some more about it) because it had your best interests at heart. It did it for money and power.
There are good reasons, based on history and human nature, ALWAYS to demand transparency and to hold institutions accountable to high and independently-verifiable standards. Frankly, only fools and scoundrels pretend otherwise.