Because it doesn't work.

I wish it worked! It does feel like something out of a cyberpunk novel. I loved "Crypronomicon." There's nothing punk about Bitcoin anymore, though. IBM, the least punk organization in the history of mankind, wants to sell you a blockchain. The promise of Bitcoin is the idea that individuals, not large financial concerns, have the power. Coinbase just IPO'd for an eye watering amount of money on the premise that people who want to buy and sell Bitcoin are probably going to have to do it through them. What's less punk than an IPO?