This is one of the reasons for stealth camping. Who knows what the rules are. Even asking for permission is questionable. I have been on the receiving end of that, and there was always a lot of hand wringing, hope the person wouldn't burn the place down, etc... That occurred after the person had left. It wasn't cost free for the landowners. Yeah, they wanted to be good guys, but at the same time probably most of those invites for dinner have less to do with you being so fascinating and more to do with getting your fed and evacuated without your burning the place down or leaving your waste all over it.

And of course, occasionally you get shot asking at the door. Imagine the mental anguish the shooter went through both before and after the event.

One of the places I have property, we can't even keep hunters off, they have a right to hunt private land. I'm pro hunting, doesn't mean I want hunters on my property. There are risks that it is far easier not to deal with, and they are the last of the great litterbugs, along with smokers. I'd say one time in 50 years running your chainsaw into a nail they put in your tree is enough reason not to want to have them on board.