A Detroit tech business took home the Game Changer award and $50,000 in venture capital money at Alphabet Inc’s Demo Day with Movement — the first automated video ad tool of its kind. Waymark, a tech start-up that was founded in San Francisco in 2012 before moving to the Motor City, has created a platform that generates a customized video ad in 10 seconds. “There’s a lot that goes on in those 10 seconds,” Waymark CEO Nathan Labenz told Benzinga after returning from California, where Demo Day was held June 8 at Google’s Mountain View headquarters. The Movement platform uses a business’s phone number to pull all the information it can — social media, reviews, website content — before generating a custom video. “It’s fully automatic and you can do it on any device,” Labenz said.