Ethereum was just the latest wiped out in one stroke lasting minutes?
eth was approx $10 at beginning of year...now $459...you do the math.
Wiped out?...no the spike down (you refer to) only affected those with "coins/tokens" at risk on the exchanges trading platforms. Those holding in their own wallets with their own private keys were not affected.
Similar scenario to those trading gold cfd's/paper contracts vs those holding physical gold under their own control.