I really like the idea of a geographic danknet (ie, a network you can only access when inside "the zone") so I've been meaning to get a couple of SBCs and play around with it. Thanks for the reminder, unlike last time when I was looking into this I actually have some cash now.
But a single AP is too small to be actually useful, in my opinion. The really cool stuff happens if you can manage to join a few together and create a meshlocal, which I think must be the logical long-term goal of this sort of thing.>>6407
One thing I came up with was that you could set one up at a popular club or bar, and people could use it to share music (or hook up with dealers). The password could change somewhat regularly and be given out just by word-of-mouth or texting. Not perfect but it's a use-case.