Well, I still don't think that's concrete evidence of maliciousness. First and most importantly, the crypto market can drop 15-20%+ in a 24 hour period; simila

Well, I still don't think that's concrete evidence of maliciousness. First and most importantly, the crypto market can drop 15-20%+ in a 24 hour period; similar rises take multiple days on high-volume, large-cap coins. This is actually not specific to cryptocurrencies, there's a well known phrase in the equity markets "bulls take the stairs, bears take the elevator (or 'the window')". Similarly, with such volatile assets, when the price falls dramatically, many people are running for the exits. On the other hand, when the price is skyrocketing, many people have a "hodl" mentality, think the price will rise up further, etc. If the price falls off a cliff everyone is trying to sell, but when the price spikes many feel "I missed my chance, better wait for a dip" and aren't rushing to buy.