I'm skeptical as well. While the terms are broad there may be a reason. Statistics and game usage information for developers come to mind. I'm sure there are other rather mundane uses of this data.

The content and scope of the ToS seems rather scary and far reaching, but one has to wonder if Nintendo is publishing thie ToS because it intends to use the devices as surveillance devices or are simply protecting their collective *sses from a litigious society.