Definitely okay with Bitcoin, but not with gambling. There is no law that prohibits minors from learning about Bitcoin, and learning itself is a long process, so I don't see a problem if they start early and build their own knowledge.
As far as I have experienced since the day I have been in the crypto space, what i analysed is that if you want to start Bitcoin mining, then you really need to acquire good knowledge about the mining space. As for this, you really need to gather technical information and knowledge about the blockchain and Bitcoin network.
You need to learn how to find or calculate the complexity of the network.
What are nodes? What is the current reward per block....
And learning about many such terms can help you a lot if you are going to start your mining journey.
But it's also not something we should force them to do. Bitcoin is mostly associated with investing, and minors usually don't have their own income yet since they still rely on their parents, so they don't really need to invest right away.
So what do you mean? Haha, mining is a free thing? To jump into this space, you still need investment...
Well, let me ask you some questions... Don't you need a good power system that will further be connect with network to start mining? Does it come for free? Obviously not? How will you cover your energy consumption cost? Does it come for free? Obviously not.
I know maybe you are thinking about alternatives to cover the cost of energy, like solar panel, is solar panels come for free, haha? Obviously not...
So either you are investing in bitcoin or want to start bitcoin mining, you will need money... But at the initial stages of bitcoin mining, you just need to invest one time, and with the passage of time, your money will be recovered. CMIIW!