It sounds like a lot of players do believe in off-limits areas. While keyword searching Google Maps for "graveyard" or "cliff" would work for most situations, I doubt it will catch every area that's truly off-limits, and some valid places to play would be flagged as off-limits.
Do we want a hybrid of automating the off-limits flagging from the game release with a player white/blacklisting system? Or are there other ideas? Is there even an answer?
The problem with this system is that some players would abuse that system if power is given to them. What checks and balances do people suggest because a 'benevolent' approval community would require a ton of labor to upkeep.
I am an Ingress player, so I know how well that 'benevolent' approval committee works - not quickly.