By Rob Lenihan Online real-time wagers on plays during sports events are expected to soar in the next few years, but gambling addiction experts are concerned. Sports wagering can trace its history back to ancient times when the Greeks bet on the outcome of the Olympics. It has accelerated over the centuries to a point where today people can place bets through their mobile devices. The Covid-19 pandemic boosted online sports betting dramatically. Goldman Sachs expects the market could reach $39 billion in annual revenue by 2033, up from about $900 million currently. But betting on a game is mor…