This Couple Built an Obscure Corner of Sports Betting Into a Billion-Dollar Business
Wall Street Journal
Even before online wagering on sports was legal in the U.S., Anna Sainsbury and David Briggs predicted that gambling apps would need to know where their customers were. These days, almost no mobile betting happens without them.
https://www.wsj.com/articles/sports-betting-geolocation-geocomply-2b6bf288