Recent hits include Charlie Brooker’s interactive Eighties London drama, Black Mirror: Bandersnatch, which allows viewers to choose how the plot unfolds and Alfonso Cuaron’s Seventies Mexican film, Roma, which has 10 nominations for next Sunday’s Oscars. New entrants to the SVOD market face daunting challenges: first, investing in streaming is costly because a company must build the technology, acquire programming rights and spend on marketing.