I think it is important to address a few myths and facts about gambling because there seem to be many irresponsible people claiming many different things...
It is not clear to me that these are myths when most of them have some truth to them. They are myths if they are stated in a radical way, for example:
Myth 1: Online casinos are illegal.
I don't know anyone foolish enough to say that, but put like that, yes, it is a myth.
Myth 2: You can count cards on online blackjack tables.
This would be a myth if I said it was winnable or easy to win, but a quick search shows that this has long been impossible in most cases, so it's not a myth because it's partly true, you can count cards if you want to, it's just a matter of whether it's profitable for you.
Myth 3: Underage children can gamble online.
Fact: Most casinos demand KYC (Know-Your-Customer). This protects children from access to underage gambling.
This point seems particularly important to me because you have tried to debunk a myth and what you say is false. Minors can gamble online at most cryptocurrency casinos. I have never been asked for KYC in any of them, although some of them have KYC requirements in their ToS, what happens is that it is usually from a threshold of money in account or money wagered.