Zhu Hao, an office worker in his early 20s, recently checked into a hotel in China’s southern city of Shenzhen for a weekend escape with a couple of buddies. Their plan: Play video games until early morning, order in and maybe take a break with a quick massage.“It’s boring to play by myself,” said Zhu, who loves gaming getaways so much they’ve become a near weekly routine. “And here at the hotel, my parents can’t nag me or interrupt my gaming.”...