In a bustling Hong Kong commercial district, some internet cafes are shifting beyond serving as gaming hubs for young people looking to spend a few hours hunched over a computer playing video games. Inside one such venue in Mong Kok, gamers can rent one of two private booths for about HK$200 (US$25.52) a night. With a look that can only be described as “emergency bunker”, the metal-walled rooms come equipped with a high-end gaming desktop, a sofa bed, budget-friendly food, and self-service...