I am not sure about the millionaire status. But you can make a good amount of money depending on how intelligently and how dedicatedly you trade or invest in crypto. I have heard that people have gained a lot with the rise of Bitcoin because they invested in it at the right time. So, you need great timing, learning, and strategy to gain profits in cryptocurrency. Maybe one day, the millionaire status will come true for every crypto investor.
Really your concept is a welcomed development actually, but getting the advantages of rich towards cryptocurrency investment is base on luck and the project of the particular coin, you can invest on a coin and after period of time the coin run out of the market due to bad reputation of the coin, so therefore i will agree with you about timing for the coin that has values already and newly listed coin's are good for investment, so those species of coins are the one that turns an investor to billionaire.