Business was brisk at the HHB Music House on a recent Thursday night. The live music venue, located just a short taxi ride from Alibaba Group Holding Ltd.’s headquarters, was crowded, with virtually all of the dozen or so tables and booths occupied by Jack Ma fans ordering Alibaba-themed cocktails with their Alibaba mobile app in the dark and listening to cover songs by the house band. Many were probably hoping to catch a glimpse of its most famous customer, who hasn’t been seen or heard since November.
Ma, who used to come at least once a month to the bar