There's a wider meaning of "off the grid", describing people who have taken themselves out of much of what we consider to be normal society. They don't have bank accounts, they live in squats or in cars/minivans (most of which are neither taxed nor insured), have mobile phones that are potentially untraceable, and have neither electricity or gas supplies. As a rule, they are people who people who mistrust the authorities and do not wish to be trackable, as much as that's possible.