Well obviously, you do not teach kids about bitcoins and other stuff that involves complex procedures due to the nature of them. Teaching them these kinds of stuff will get you nowhere since what's important for them at this early age is their own happiness and the stuff that gives them satisfaction BUT there is always a way to teach them the basics. The idea behind is that you do not teach them directly about bitcoins but you teach them the proper attitude of handling money. For example, if they want to buy something like a toy or a candy, they need to earn it first by cleaning their toys' mess or helping their mom with simple tasks. It does not need to be hard but the idea is still there. It might be different from teaching bitcoins but it helps them properly handle their money and also by EARNING it. Once they have matured, then that is the time to exposed them to bitcoins. The good thing here is that before you explain them everything by investing, they already have the proper attitude on handling and earning money. The context might be different but the idea is the same.
This huge block of text sums up to: "Teach your kids how to manage money by making them earn it through small tasks." Really, though? Your kid has to clean the house before he can ever have money? Well congratulations to you for having small maids. Congratulations for having your very own slave. Kids aren't meant to do these things because they are just kids. They have to focus 100% on learning new things in life. Kids wouldn't appreciate what you're doing to them. At some point your kid might even think that he's being enslaved.
Your kid will grow up thinking that every thing has to have something in return. Once they helped somebody else, they would always expect money. Even when they are helping a friend, they will expect the friend to do something about it but life isn't like that. Life isn't fair. You do something good to someone, you don't know if he's going to pay back. Your kids will be devastated when they found out about that.
You wouldn't be paying them for everything though... It's not that bad to make them do some chores for their weekly allowance, it doesn't mean that they suddenly become your maids, that's a bit of a stretch imo.
It teaches the kid that having good work ethics is rewarding, which he would also benefit from later in life.
And they'll probably be better at managing their money because they've worked for it, seems like a good lesson to teach them about the value of money.