So do you feel the naming was inherently misleading which led you astray? Because incognito mode absolutely kept things 'sneaky' in terms of hiding the things I look up from other people who use the same computer. Which is specifically what Google said it would do and showed examples of in TV commercials. And it definitely did (and still does) that.
I'm also struggling to understand what you feel you 'trusted' Google on exactly. What did they tell you that you believed but, as it turns out, was not true?