Of course kids under 18 years gamble. If they do it on some site it may be profitable to them and let them increase that amount of money that their parents give them as pocket money.
I don't gamble my pocket money, nor do I get pocket money. Never have I used my parents money for anything related to something online. The thousands that I've gambled were all made by working online, bug bounties, ect. Pretty sure no one gambles their pocket money as it'll take way too much effort to get under $200 cash into a VCC or btc.