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.
Yes, that is the possible issue but on the other hand I don't see why would e sports be a bigger threat to minors than the other types of gambling. Yes, it's hard to control them and today everything is available on much easier way to minors and children than it was to previous generations. That is why prevention is very important and how these children are raised. When something bad happened is very often too late to react.
Because kids right now have easy access on these things. They can play without the knowledge of their parents. But they will learn their lessons in their own way, if parents are not there to guide them. Since parents can't attend their kids 24/7, the kids themselves should be responsible on their actions.
Of course parents would not be ther 24/7. But it's helpful for the kid to know about how it from the supervision of the parent. Cause you know some kids can do well without someone supervising them but some kids need the supervision of their parents, even though its just a one time talk, it will help the kid be knowledgeable about it. To know what's right from wrong. Kids are kids and they need supervision.
KYC could help to minimize youngsters to go gambling but the fact that not all gambling sites require such a thing, below 18 years old could gamble. They have their phone, laptop/PC, online gambling is very accessible to anyone and sites can't hold them nor to stop youngsters to gamble unless KYC is required. But that is not the case, it probably gambling site owners will allow them, they are making money from it.
This may hit back on them because many gamblers would move out if KYC get compulsory to sites where no KYC is required. So, no one want to lose their business and also today's kids are very smart they would take somebody else KYC and still play it and no one will know as well. So, this is not the perfect solution. Somebody from their family would have to keep a watch.
This KYC will never be a solution, years ago I'm just a kid, and I remember fully well when I easily entered sites with KYC with it. It's too easy. And you are right, owners doesn't really want to put KYC, they were just following the rules from the authority to continue their operation. As long as they're earning from the customers, or gaining customers, they don't care what the outcome is to other people.