You're saying it's idealism, I wouldn't call it that.
This to me is the social contract that binds our relationship as consumers with these companies.
If I cannot trust them, it means I can no longer recommend Google.
And I already stopped recommending Google's products a while ago. What changed now is that ... I'm actively recommending against them to everyone I know and that is using a Google product that I happen to notice.
Of course, I'm a single individual, I can only influence my friends and my Twitter followers maybe, and I'm sure most of the time I'm preaching to the choir.
But I felt that way when I was recommending against Microsoft, since 2005. And guess what, enough people started to do it and it started eroding on their influence and market share, coupled with their own blunders of course, the classic "inovator's dilemma".
And as a datapoint, I think one of the primary reasons for why Windows Phone was a failure was because developers rejected it, due to it coming from Microsoft. Now you can talk all you want about market share, monetization and tell people that developers go where the money is, but I remember people hacking for Android phones ever since they hit the market and it took a really long time for Android to become barely profitable for app developers (it still isn't actually), not to mention a worse experience compared with Apple's APIs, yet developers embraced Android. Thus that lost sex appeal and trust that Microsoft had back in the days of Windows 95 was lost and they still haven't recovered, which prevented them from getting a foothold in a market that really matters for their future.
Nowadays Microsoft is doing fine, but they had to make some drastic changes to regain the lost trust, as they were going downhill, even if it wasn't necessaril and please notice that in spite of their best efforts, they still haven't regained that trust. Notice what happened when they acquired GitHub. Not the kind of reaction you expect when you buy something for 7.5 billion. Although I'm sure people will get over it soon, if they don't screw it, like they screwed Skype that is.
So you know ... I might be idealistic, my colleagues too, but judging by HN's reaction and the reaction of people I follow on Twitter, to me it's clear Google's image has changed and it does matter because we can influence their future.
Companies can choose to not care. But that's how they eventually become irrelevant.