Unfortunately, at present, in most countries, the legislation has insufficiently developed legal rules governing the participation of minors in games through online casinos.
I would say that there are almost completely no controls and prohibitions on their participation in the game.
At present, unscrupulous online casinos take advantage of this state of affairs, thereby not only making money from their “children's passion”, but also forming pathological players out of their minority.
In most cases, for minors, due to age, playing in traditional casinos (with the exception of slot machines, where there is virtually no control over the age of visitors) is not available.