But with cryptocurrencies it is way worse than that, so I'm not sure you would be able to get even 20 billion dollars out of this market if all crypto were to be sold out completely. The point is, there is little to no real use in cryptocurrencies (unlike gold) which would prop up the prices at a certain level, so when everyone sells out, the price goes to zero
I was just giving the official numbers, however you are right, this market is way smaller than that figure, which leads me to think what it is the real size of this market?
I guess it's impossible to tell in advance. As we can find that out only through empirical evidence (as in hindsight). More specifically, we could arrive at a very strict and robust figure but only after crypto has either collapsed completely (read, it disappears entirely like it was 2007) or gone down so much that the margin of error becomes statistically irrelevant
And then we could analyze every trade made and see how much the market was really worth at a certain point in time all the way down the road (by looking at the price and volume dynamics). The takeaway is that we can't obtain the real size of this market but simply for practical reasons (not that it is impossible per se)
If anyone knows better, you're welcome to chime in