I believe that even with the help of Bitcoin, a person cannot become too rich (a millionaire), because in order to get big profit from Bitcoin, you first need to invest a lot of capital. Of course, you can show the opinion that someday Bitcoin will reach $ 1 million, and a person could invest in Bitcoin either in 2010 or in 2016 or today in 2021, But in order to become a millionaire as a result, he needs to wait for more than one year and perhaps more than 10 years.
And the opposite can happen too, many people can sell everything and hold in crypto and maybe as you said, after one year or 10 years, they lose it all and become bankrupt. The best form of investment is continuous flow of money and transaction and limiting one's lifestyle. But is it worth to waste the teenage years and 20s by saving money without enjoying it just for the sake of being called a "millionaire" in 40s or 50s? I guess not!