Gambling actually is a big point of contention in the EU, because countries try to control it/grab profits from it and regularly get in conflict with the free market rules. E.g. Germany is under pressure because most German states only allow state-run organizations to offer sport bets, "to limit gambling addiction". Which would be ok, but at the same time they heavily advertise for it, which made the argument hard to believe to EU courts. (State monopoly on gambling is just so very, very profitable...)