Well, you can just pack your backpack with the essentials and disappear into the woods.
However, you then have the problem of being exposed to extreme temperatures (last night, for example, it was -7 degrees Celsius or more over here). If you can't find a hut and make a fire, you'll probably freeze to death...
With every digital step you take, you have to think about the trail you're leaving behind. Whether you can cover your tracks.
And not every app needs to know your location—there are special bags for smartphones that cut off all external connections. That way, you can have it with you and it definitely won't send anything.
We live in very strange times... we are experiencing the beginning of something new—and many are completely unaware of it.