In most countries gambling is prohibitted. Any gambling that is not approved by the government is illegal. I think the government is right. They have a valid reason for doing it. But since online gambling is uncontrolled so people who find it fascinating to gamble make it online.
I wouldn't say that gambling is prohibited in most of countries, rather it is forbidden in few countries.
Gambling is not wrong, people are not responsible and making it looks wrong. Speaking of prohibition, alcohol and tobacco are legal and compared to gambling they've ruined more lifes. How many people died of cancers caused by tobacco and alcohol, how many wife's and kids have been beaten because their husbands were drunks and their life ruin because of that? Gambling is nothing compared to those two.