Yes, I know that Google doesn't do nefarious things with the data they collect. That doesn't mean we shouldn't scrutinise the way they track online behaviour so relentlessly. Even printing to your desktop printer in ChromeOS is recorded by Google because all print jobs go through Google's cloud print service.
If people thought their Linux, Windows or Mac Operating System was constantly logging their actions and sending back the details to the OS vendor, they'd be angry. When companies ask for app usage data they do so on the promise that it's anonymous and they tell you what they are recording and why. Google tell you nothing and you're not even anonymous (you have to sign in with a Google account to use Chrome OS. A guest account gives you limited access and even that's probably being tracked).
How does Google get such a free ride on such matters? The response from the tech community generally seems to be "meh - it's a non-issue, I'm fine with Google collecting my data". I find it pretty depressing.