The fans flooded through the streets of Riyadh, Saudi Arabia, by the thousands, kept cool by mist machines in the 110-degree heat. A 30-foot-tall replica gold trophy towered over onlookers at the city’s center. For a moment, covered in beams of brightly colored light, a country defined by tradition looked futuristic. It was the inaugural Esports World Cup, a coming-out party for Saudi Arabia’s growing video game industry.