This doesn’t work (except for the coastal overlap issue) because they are laid out on a set grid that is the same for all observations posted. For instance below is the area near my house where i obscure a lot of stuff, and my house isn’t in the center of that rectangle. (no it isn’t one of the pink pins either).
On a side note please don’t post things about figuring out obscured observations on the forum. You are correct that the system isn’t perfect, and it doesn’t make sense to broadcast loopholes publicly. Meanwhile, for anything with serious security risk or otherwise top secret, it’s probably better just not to post it here or anywhere else on the Internet. It’s unfortunate, but nothing private on the internet is ever really guaranteed private.