The only issue I can see with this is the possible effect of esports for minors to gamble. Most of the systems and gambling sites at this time have good regulation already to avoid this kind of scenario to happen. In addition, minors have their parents to remind and supervise them to avoid gambling.
Though, minors IMO even without gambling sites could already be expose to gambling through the game itself. Most of the games uses credits for skins and usually, good skins comes from the raffle. Thus, exposing them to implicit gambling already.
But still, the gambling site has a problem to detect their visitor, whether they are kids or they are adult people.
Kids can visit on the gambling site without their parents know what they do, and the kids can play gambling secretly.
That is a job for the parents to watch out their kids before it's too late.
So besides parents need to take care of their kids, they also need to check on the kid's mobile phone to see what game they played.
If the kids want to buy something from the game, we should remind them that they don't have to buy anything.
It is true that it is very difficult for gambling sites to know the real age of the users without KYC procedures. Even some gambling sites
have brought esports in, which I am afraid of children who used to play esports so they can access gambling sites. Moreover, millennials
are now smarter than their parents in terms of technology, so if not supervised and restricted by parents when accessing the internet and
playing games, it allows children to access and play gambling secretly. The role of parents is very vital, usually, as a parent, I accompany
my child when they access the internet, to ensure that my child doesn't access gambling sites.