Remember Eric Robert Rudolph? He was an expert survivalist. The Feds said he probably never would have been caught if he didn't get lonely.
Rudolph was caught pulling scraps of food out of a giant metal garbage bin.
He stayed off of the grid for a few years, but living like a caveman is tough for formerly civilized people.
Most people only last a couple of weeks off of the grid, so he did better than average.