Like, are there some gamblers who, if it were made illegal, would do it illegally in harmful ways? Yes! Are there enough such people that the social harms of banning gambling would be significant? I don’t think the data bears that out. This isn’t prohibition; this is something that has already been widely proscribed by law in the past without serious negative consequences (other than missed opportunities for riches on the part of the gambling companies that pushed to relax those prohibitions over the last decade).