Anyone who has been SKILLFULLY trading crypto for 3-4 years should be a "millionaire" by now (though $1 million is not what it used to be).
I say that because there are a LOT of people in crypto who just got lucky (but think they are smart)...
And people who luck into wealth almost always have it stripped from them in 1000 ways.
The dotcom millionaires and multi-millionaires are interesting.
A million dollars was a big deal back in the 1990s and if that was invested in real estate it would be worth a lot today (remember that real estate prices, in most areas of the world, have skyrocketed since the 1990s). But the documentary I remember seeing was it said a lot of those dotcom rich kids (under $10 million) lost all their money in divorces, gambling and other big expenditures (reminiscent of lottery winners).