The reason we attempted in the United States to safeguard the Right of Privacy in the Bill or Rights was because personal information is always eventually used as a means of control by authorities.
If you're not violating another's Rights, it's no business of anyone else where you go, who you call, or what you watch; to have that monitored and recorded without your consent is abominable.
The presumption should be that all data is private, unless you have explicity granted consent for its use. Sadly, the presumption now is just the opposite. The notion of warrants, where government was required to state its case regarding illegal activity seems to have gone by the wayside.