Interestingly enough: earlier today this discussion was trending: https://news.ycombinator.com/item?id=47769089 (Cybersecurity looks like proof of work now)

the article here is pretty clearly a response to the one you posted

	▲	onionisafruit 8 hours ago \| parent [-]
		It’s only clear if you know it exists, and now I know it exists thanks to gp.