I think gambling sites only want huge profits with the number of members playing on their sites, regardless from of the data used for Kyc real or fake so far, because their dont care about age limit rules , I think to prevent minors from gambling should be the main responsibility of parents at this time, although it may interfere with their activities but parents should take the time for regular supervision, such as Monitoring children online activities regularly can be done without must to stop working, like checking browser history and using monitoring tools if possible.
If parents are not aware and can't save their child then there is no other way to save them. The site might not be prevented from using fake information, fake documents, or documents of parents and/or other family members. But if parents are aware of this then it might be possible to prevent them to engage on gambling.
Its understandable that parents will really be needing up to guide their children but we do really know when it comes into this aspect that not everything should really be blamed into the parents or guardians on which we know that there are indeed instances that no matter how hard we do tell our kids about avoid this and that but still ending up on making out some engagement secretly or hiding up on which not all parents will be able to monitor out due on busy on work or there are tons of things that we do really need to do as parents but of course you should really be that also minding on what your kids is been doing. Raising up your kids is very challenging and you will really be needing up to guide them as best as you can as a parent but there are things on which we cant be able to control or stop or will be able to notice it out to stop them midway.