Yeah, the only places that are going to be shared are well known bass lakes, that receive lots of pressure, or stocked trout ponds. Just lakes that you can find out all about with a quick Google search. I actually think its a neat idea for an app, but I think a lot of people would be hesitant to share spots.
Surprisingly a good majority of people do share spots, but i agree, its because most of the spots around here aren't anything special, and already receive a lot of pressure. I mean obviously if i caught a 10 pound bass i wouldn't share where i caught it... But i don't think that day will ever come haha