in the hidden wallet, as 2000$ may be a big amount of money for him
~
So there are many people who may have an insignificant amount of money stored in unstoppable wallets but that money is significant for them.
My take:
nobody should keep "a significant amount" in a hot wallet, including "hidden" hot wallets. If you don't care about losing $2k, then by all means, keep it in a hot wallet for your daily spending. But if you can't risk losing $50 (for instance because
you earn $12 per month), then you shouldn't keep it in a hot wallet.
I was actually thinking of getting my kids a crypto wallet Let them choose if they want their allowance in cash, or magic internet money. Their allowance is too low for Bitcoin transaction fees, which unfortunately only leaves altcoins. But there's not really a point if they can't spend it to buy toys online. It seems problematic to introduce kids to bitcoin through shitcoins....
You're right. It sucks not being able to use on-chain Bitcoin for small amounts. Not only for my kids, but also for many people (like mentioned above) who would spend a week's worth of wages on a transaction fee.
Using LN isn't really an option either: I don't want to teach them to use custodial wallets, especially long-term, and non-custodial wallets come with high on-chain fees for opening and closing channels.
If it wouldn't be so much work, I'd setup a testnet webshop, in which they can order candy using their Bitcoin testnet mobile wallet. Like
Starblocks, but for kids, and I'll actually give them the items they order.