To be absolutely fair, speaking as a newbie, there is next to nothing in the new user orientation on how to tell what is private land. The learning curve on this is really steep, and I wasn’t even aware there was an issue until I was mentioned as an interloper at a place I wound up at. I have teleported several times to an interesting destination only to find no one there... so I start flying around looking for someone — ANYONE— to interact with. I guess that puts me near someone’s private property but I have no way of knowing. So if you don’t want accidental visitors you need to designate it as private property. Or have LL figure out a way to exclude non-guests.