I want to clarify my point on gambling too. It's psychologically manipulative. This is for adults and children. Do you agree it's morally wrong to manipulate people into making purchases? If so, you should be against their gambling. Pushing it on kids is just particularly immoral.
And yes, parents should be responsible for their children. I'm not asking for age tracking to restrict children. I'm asking for them to not be pushers, trying to get children addicted to gambling. That's on them, not the parent. The parent should stop it, but we all know that isn't always going to happen, and taking advantage of this deficiency is immoral. They specifically create things that are aiming to get children into their casino. Two people can be at fault for this situation. The parents and Valve are to blame.
As an example, if you made a Bluey themed casino and advertised it on Nickelodeon, or wherever kids watch things now, that'd obviously be fucked up, right? I hope we can all agree on that. If so, you don't think it's solely on the parents. We have a responsibility to call it out, wherever it's happening, because raising the next generation of adults is the responsibility of all of society. Yes, primarily parents, but everyone. That's why the "think of the children" garbage is so effective. Basically everyone agrees with this, so it's easy to abuse.
This isn't saying the age verification is good, just because it uses that argument. It isn't honest about the intent. That's an excuse. That doesn't mean there's no marit the the argument itself though. It's just being abused to do evil things, as evil often does.