Why would you assume they hate it? The problem, afaict, is just controlling it. It's hard, almost as hard as the drug market. If they find a way to prevent anyone from gambling online without their approval and scrutiny, then you'll see online gambling on government sponsored ads everywhere (with a disclaimer saying "gamble responsibly" in very small letters). The same applies to bitcoins in general, it is just something they don't control which means can't easily tax, which obviously is seen as a threat, especially when they have a concurrent thing, which is controlled and taxed by said governments.