IIRC that originated on the largest Russian car-related internet bulletin board. They had a rule about posting classifieds that said "if you're selling your car

IIRC that originated on the largest Russian car-related internet bulletin board. They had a rule about posting classifieds that said "if you're selling your car, you're selling in Moscow by default, if you are not, explicitly state your locality at the very beginning and at the very end of your ad or don't complain about people from Moscow calling you".