Inside a tiny self-service laundromat in Quarry Bay in the east of Hong Kong Island, next to a wall of washing machines, stands a waist-high cryptocurrency terminal with signs reading “Elon Musk recommends Dogecoin” and “Buy bitcoin in one minute”.In order to obtain Dogecoin through the ATM, customers feed Hong Kong dollar notes into a slot and scan a QR code. The equivalent amount in cryptocurrency is then credited into their digital wallet.Such machines have proliferated across the city in...