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Re:Filecoin Suspends ICO After Raising $186M in One Hour by dahdum on Friday August 11, 2017 @03:32PM (#14993369)
The majority of the global volume is crypto-crypto, so I agree it's a valid concern, but the volume of fiat trades has gone way up over the past several months. For example, Coinbase added 1 million accounts in June - the vast majority by necessity are putting fiat in vs cashing out.

One flash crash happened on the ETH-USD pair on GDAX like a month ago, when a large dump triggered cascading margin calls. Bitcoin has had a few of those over the years too.

Re:Filecoin Suspends ICO After Raising $186M in One Hour by lizardhunter on Friday August 11, 2017 @11:19PM (#14996263)
The volume on many exchanges are fake. It's pumped up using bots buying and selling among each other. Large dumping tends to go through dark pools or OTC. The real volumes are much lower.