[jandrewrogers]

It is possible in British Columbia, which is both vast and relatively easy to survive in. Entirely believable if you've been in that part of the world. It is also largely unexplored due to the remoteness and impenetrable terrain. My parents used to live in a village in the southernmost part of the Inside Passage[0] near the British Columbia coast. It was well-known among the locals of small groups of people (usually a few families) that would intentionally disappear into the uninhabited parts of the region to live off the grid. Not too frequent, something like once every decade or so. For most people, moving to a remote village with irregular postal service in the Inside Passage is sufficient to satisfy their desire to drop off the planet but a few take it a step further.

The location of a few such settlements were known to the locals, because they had been spotted by hunters or fisherman due to being in relatively close proximity to villages in the inside passage. Others groups disappeared much deeper into the fjords and into the mainland, usually after buying supplies in Ketchikan, and were never seen or heard from again. Anecdotal but interesting.

[0] https://en.wikipedia.org/wiki/Inside_Passage