I think this is how we could explain this to kids:
Cryptos are a nice shiny cake, made by a community kitchen.
Chef Nakamoto provided the original recipe, others brought the ingredients.
Customers seems to like this community cake and pay to acquire a slice of it.
As the supply of cake slices starts to finish, the cake increase value and people start trading it for money.
Now the owner of the money wants a slice of the cake too.
The owner of the money really wants a slice of this cake but doesn't want to admit it's an edible and valuable cake.