>>91483595anon, it's turned on by default, and most people regardless of their skill use internet through their phone while their main account is on.
Ask yourself this, when it was the last time you bought something you actually needed from the personalized ads?
you are not fucking John Titor nor that Luigi kid anon, you are a fucking byte in an internet database made to mindfuck you into buying shit you don't need, that's all there it is to it.