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.
Your not necessary to be intelligent you just need some guidance and style when it comes efficient to that. Does being millionaire means you had some experience or great background? No right? Sometime a lucky airdrop could do it for you already or some good bounty you joined or a good bought on uniswap like shiba, anything like that could do it.