They may not be negatively impacting you.... today.
But think about everything you've ever done online or on your phone. Ever. Now think about what that set of data will look like in 10 years.
THAT is the power that Google has. It's the power that Microsoft DREAMS about. I'm not saying that is good or bad, but the fact is we don't KNOW what they will, or can, do with that data.
But I do know that they can do incredible things. They can do incredible good. Look at something like street view on maps. Astounding. And it's only one example. Bottom line for me is, I don't understand why people willingly share all of their personal information. Facebook, Google, etc. There is no privacy anymore unless you really try. Banks track all of your transactions, go into a casino and they monitor your wins/losses to find that sweet spot where you'll keep playing. I am sure that there are many many other things they are doing that we don't know about. But we get complacent because of convenience.
I'm not paranoid, it is the reality of today, and of tomorrow. Google is not bullet-proof, and they could someday be bought by another company, who could then own all of their data. The information age is an incredible one, all of that information is power... and you and I don't own that power.