Sounds like a great idea. I put all the cash I received for the children on their birth and Christmas into an account, saved until they are 18, accruing interest every year. My youngest is 18 in January and is hoping to travel around Europe with friends using this money. It worked for us.
my wife and I have done the exact same. I am curious if there is a crypto version of this. I want to buy around 100 in crypto and just let it gain interest.... staking maybe?