> Venmo is a free service to transfer dollars, and bitcoin transfers are not free
Venmo is not free. There's a cost, it's just hiding.
> Blockchain-based trustworthiness falls apart in practice...
The particular brand of trustworthiness the author is arguing against is indeed a myth, but that doesn't mean blockchain is "crappy technology" or "a bad vision for the future"
Blockchain adds a new thing to the world: digital property that cannot be reproduced for free.
Smart contracts add another new thing to the world: the ability to build immutable software that interacts directly with the financial system.
Both of these ideas are very powerful, and almost all of the interesting blockchain projects are still in the R&D phase.
The hype around blockchain is ridiculous and absurd, but that doesn't mean the technology isn't exciting or potentially transformative.
edit: I actually wrote an article about the "trustlessness" thing:
http://cowpig.github.io/bitcoin/ethereum/poker/cryptocurrenc...