With the implementation of new technologies (i.e. apps, programs, operating systems), the end user is given less and less choice to make their data private or local PC based.
As an example with regards to Microsoft's Windows operating system, upon a fresh installation you can create a local user 'account', but you are 'enticed' into creating an online profile, through the various Microsoft based email account domains such as hotmail, live or outlook for free.
As an example in the below screen capture, all you have to do to get 'free' WiFi access from your device is give them your email address, and you're up and running, where you give access to another entity to your information.
Note: For the preservation of your privacy, we do not recommend logging into any service from your smartphone.