Don't confuse market cap with amount invested. Plus wash trades.
What will happen if crypto vanishes overnight or due to some or the other reason if crypto becomes inaccessible to public? I know this does not make sense as crypto will not vanish but still what if it happens? What about those huge chunk of investments made by whales and other investors?
if that really happens, it will surely cause an economic crisis. Because all this money is not just our principal, there are many people who borrow from banks to invest in this market and the amount has reached $ 190 billion. So if the crypto market collapses, the whole world will lose over $ 190 billion in fiat money and it will surely be a major influence and sharks will die. I don't expect this to happen, it will make millions of people poor.