I do not think it is about taking kids out of it. I do not think governments are run by morality. The main reason will be what dothebeats said. Government wants to make sure no tax escapes. If government wants to keep kids out of gambling, there should be law on that and it should be enforced.
Probably there could be another way around that the government can follow that can help kids to abstain from gambling, but I do not think there can be a way the kids can abstain from gambling except the government make ways the kids can be know, a useful one is the digital ID, though it can deprive people from privacy, but the privacy that many of us do not even have before. Only few people, like less than 1% out of 100% are still having privacy. There are many sites that are requiring for ID documents and most people are just giving it out, there is no privacy before for many people.
As kids we had our little gambling games without going on the big stage or casinos. How is government going to control street and school gambling with that if not through enforced law at those centres and not some ID thing.
Wow! You reminded me of school gambling, I have just remembered my high school days, we even used solving questions to gamble, like able to solve certain number of questions and have certain number of questions answered correctly. We turn a lot to gambling. The government are not that strict to what is happening among kids so far they do not harm each other and this is not addicting.