Wise advice from @kepford here. Letting kids rely on their BS detector is a sound life skill these days - pushing a kid can do the opposite that you want.

I've never pushed mine - they've done work to get Bitcoin. Be prepared that it might be all about the price for them at first though.

You might be inspired by the wisdom in Aesop's fable where the sun and the North wind have a competition : https://fablesofaesop.com/the-north-wind-and-the-sun.html