I get your point above, except blockchain actually did provide a solution for a lot of constituencies, like the dark web/black market (e.g. hardline libertarians, weapons dealers, drug dealers, etc — although I by no means would conflate these groups).
To wit, I acknowledge this mention you made later in your article:
“…with Silk Road, a cryptocurrency-driven online drug bazaar. The key to Silk Road wasn’t the bitcoins (that was just to evade government detection), it was the reputation scores that allowed people to trust criminals. And the reputation scores weren’t tracked on a tamper-proof blockchain, they were tracked by a trusted middleman!”
…but that’s a bit of a straw man. Of course there were a number of innovations that enabled the modern Silk Road, but understating Bitcoin is as misplaced as overstating USPS/FedEx’s roles.