Um, solve the public restrooms problem for whom? Granted I’ve been living far from DC for 20 years, but I spent a large chunk of this summer there. Access to public restrooms was the same as it is here in Seattle: only a problem if you’re a street critter. People who can scan QR codes already have plenty of access to restrooms, they just need to at least suggest they’ll buy something. Homeless people and people barely making ends meet need to be able to use a restroom, and they shouldn’t need a smartphone to do that.