The sports betting site Betr recently became the first American operator to ban credit cards for making gambling deposits. The use of credit cards for any form of gambling has been a point of contention between gamblers and industry opponents for years in the United Kingdom, and now Betr looks to be getting ahead of the curve here in the United States. For the past several months, This Week in Gambling has been generating sports betting headlines that warn of a potential backlash against the betting industry in this country. As gambling on sporting events continues to spread, and operators…