There is no proper system to check whether the user is above 18 or under 18. So there is no doubt that a lot of users are under 18 and playing in betting sites and gambling.
Of course you can't check them online, even if you ask them for ID they will give you ID from someone older.
Parents should keep an eye on their children, so that they should not gamble too much and loose.
Parents can't keep an eye on kids 24 hours/day. If they want to do something, believe me, they will find a way.
yes some teenagers play gambling illegally, as they are not allowed to visit a casino or play gambling online, but still there are some casino who are illegally giving entry to teenagers, i think the government should take serious action against such people.
Don't make me laugh. Have you ever heard of corruption?