Google has no idea what I am, or what I want. I get into so many random internet debates, that the last time I checked it thought I was the wrong gender, living in a different state, with a completely off the mark profession, and only a handful of the hobbies it though I had were relevant. And those were vague things like “outdoors” or “sports.”
You can certainly mask yourself quite proficiently, but that isn’t the norm. Most people are extremely easy to pin down.