&gt;How much are you really worried by this?<p>I&#x27;m not much worried right now.  I&#x27;m worried about where we are going, especially with machine learning.  Take a look at the story of Target identifying when a girl was pregnant before her own father knew.  Then apply this to any area where you have any reason at all to keep a secret.  Maybe you are gay with parents who will rather you be homeless than living in their home.  Maybe you have a mental illness but rather the rest of the world not know about it.  Maybe you like democracy in a country where you aren&#x27;t allowed to.  Eventually they will find ways to tease this information out with all the data they have tracked about us.