When Marc Guyon, a French national based in Hong Kong, decided to visit Shanghai in early August, the main attraction was not the city’s art deco architecture, but its driverless taxis and hotel delivery robots.“It’s super impressive – China looks futuristic,” he said. “It seems like all expats have the same reaction. Many of them share content online, and so do I.”This kind of reaction is becoming increasingly common as China experiences a wave of “tech tourism” – a social media-driven trend...