You are right, I have noticed this especially with the tiny house people. They build the house to save money and then park it somewhere. But where? Almost inevitably, it's family land, like a farm or something.

Other posters have noted this but Canada is almost unique because of its vast forested wilderness and sparse population. If you wanted to buy a parcel of forest somewhere and build a cabin, it wouldn't be a particularly expensive undertaking, so long as it's well away from an expensive urban area like eg the Lower Mainland of BC.