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The take away here is that many (all?) crypto exchanges are failing to properly secure their systems.
When your adversary is a nation-state with an actual army of hackers that can work 24/7 and deploy 0-days, it’s hard to say for sure the exchange is at fault for not handling security properly. This isn’t a lone Kevin Mitnick pulling a stunt, this is literal cyber warfare.
There are ways to clean crypto, by mixing it with other sources. See crypto mixers