Overall, I am inclined to say that this is a submarine and HN is falling for it.
Regardless, more to the point of the article, the argument and moral panic rings hollow. Chia just incentives other people to store data for people who want to store data. The place, overhead and mechanism of data retrieval is different, but, still, someone wants to store the data there and they pay for it. So how then is this more of a threat than cloud providers for example?
Later Edit: I mistook Chia as having a similar approach as Filecoin, but, on closer inspection, it seems that they do not store data people want they just store data to prove it's stored and use that to distribute mining rewards. So I was wrong at this end. Still, I maintain my opinion this is a submarine.