"I say if you do not become a millionaire in the next 10 years, then its your own fault."
It's a big statement! An 18 year old male who grew up in an affluent family, is not a good fit for making such statement! Becoming a millionaire doesn't make you eligible for such statements!
I remember this kid. He came off like a privileged, entitled jerk in his interviews. Not everyone is given thousands of dollars by their grandparents to buy whatever they want!

It sounds like he was just immensely lucky that his brother introduced him to Bitcoin, and that he had money to invest at the right time. That's a once in a lifetime opportunity!
usually people like this don't remain rich because they don't understand the concept of money. basically they think it grows on trees since they got lucky once. i hope it is not the case with this kid but i have seen many who came upon such large amounts of money and ended up gambling it all away by taking bad risks due to their lack of experience and lost all of it in a short time and ruined their lives because they burnt all their bridges thanks to that money thinking they were rich and stay rich forever!