I don't think the bribe risk is any different as its always been. Sports betting is nothing new in the U.S., people just used to either have to plan a vacation to vegas or find a bookie who would take their action. Wasn't hard to do. I knew a lot of people who had bookies and were betting every weekend. Legalization just meant they didn't have to maintain a relationship with a bookie, kind of like how dispensaries put a bunch of pot dealers out of work.
Computer usage is nothing new in the U.S., people just used to find a university or business to buy mainframe time from. Microcomputers just meant that they didn't have to maintain a relationship with a university.
It went from having to go out of your way to locate and operate with a bookie who had little away with the sports organization to... Pulling out your phone and tapping a couple of buttons, paying a legitimate business who can then apply enormous legislative and financial pressure directly against the teams with billions in backing.
It has dramatically changed the state of gambling, sports, and the businesses around them.
I'm talking about the bribe risk for a referee. It was always there. Probably even more so in the past when the mafia controlled vegas and bookies across the country.