chia claims that its proof of work alternative is "eco-friendly"[1]. This is also reflected in their advertising material, eg. instead of having a whitepaper they have a "greenpaper", and rather than mining they have "farming. While it's true that proof space is less energy intensive to "farm", wouldn't economics dictate that the resource consumption is equal to proof of work's resource consumption? All you're doing…
To speculate, it seems like the lowest-cost supplier will win and that’s likely to be used drives from data centers. Chia farming uses storage, but not necessarily reliable storage so maybe any drives that start looking flaky could be rented out to Chia farmers, to get a bit more use out of them? At least some data centers destroy their old drives for privacy reasons, so they would need to figure out a way around tha…
AFAIK people already buy up used datacenter drives to use elsewhere, so you're just shifting demand around.