Enlarge (credit: ITVS) AUSTIN, Texas—If you've ever asked yourself how long a Black Mirror episode might take to turn into real life, the new documentary People's Republic of Desire has an answer: roughly four years. Really, the best way to describe this feature-length look at Chinese Internet streamers is to point to the British series' first-season episode "Fifteen Million Merits," which aired in 2011 and starred Get Out's Daniel Kaluuya.