What does a scammer selling unlicensed shares in porn production have anything to do with the success or failure of cryptocurrency? Bitcoin was simply the method of payment, nothing more.
That example is immediately followed with the eBay + TicketMaster examples and the importance of centralized reputation/trust. The leap is then made to "...drug dealers establish reputation through their PGP key or BitCoin address". Ok, an objectively factual statement. The author proceeds to go off the rails with the assertion that only criminals value decentralized trust. Please.
You know why I would prefer a decentralized trustful solution like OpenBazaar? Because eBay bends me over with fees. In fact, they double dip. And there's nothing I can do about it.
It's not about illegal use cases. It's about empowerment of the individual over seemingly insurmountable institutions. The author is having the wrong discussion.