Matt Levine has a history of ribbing on bitcoin exchanges. He doesn't really lay it out in this post, though, so here is a quote from an earlier one[1]:
> The other reason not to trade bitcoin is that, as far as I can tell, the fate of any bitcoin exchange/wallet/bank/custodian is to be hacked. That is just how bitcoin works: You buy bitcoins on an exchange, and you store them at the exchange because it's a pain to keep your private key yourself, and then the exchange gets hacked and your bitcoins get stolen. ("There have been at least three dozen heists of cryptocurrency exchanges since 2011," Reuters noted[2] last week.)
In general, his Money Stuff commentary tends to have a sort of sarcastic reductionist vibe to it. Whether the ignorance is true or feigned for effect really depends on the reader's perspective, I guess.
[1] https://www.bloomberg.com/view/articles/2017-10-03/bitcoin-t...
[2] https://www.reuters.com/investigates/special-report/bitcoin-...