A former NSA guy worked with me seventeen years ago. He had been retired for five years from the agency at that point we worked together.

He did not own a mobile phone or any internet connected device. Was staunchly against it. This attitude was based on what he knew were the surveillance capabilities in 2003. Ended up retiring to a mountain cabin that was off grid.

Maybe he was crazy, but he never seemed like the prepper type. Just very very sober and serious about avoiding electronic communications.