The incentives seem designed to make it not-so-profitable to have big rigs with lots of hard-drive space. That design seems to be an effort to keep the mining f

The incentives seem designed to make it not-so-profitable to have big rigs with lots of hard-drive space. That design seems to be an effort to keep the mining fairly decentralized so that it happens across a greater number of commodity machines. But if available drive space and, as Bram says in his talk, even unallocated space, can be efficiently leveraged to back this cryptocurrency, this suddenly creates an incentive for the companies like Microsoft, Oracle, or even Symantec to start doing shenanigans in the background in order to mine Chia coins on billions of machines. The only thing currently stopping them is the egregious resource-usage of extant POW-based cryptocurrencies. Plus, there are already cases where all those companies take advantage of users resources like screen real estate, installers, usage data, etc., when the resource usage is minimal (or, in some cases with Windows 10, even above minimal). So if you make a fungible cryptocurrency that consumes less power and targets commodity machines, aren't you essentially asking the big players to battle it out to control the unused space across billions of machines? Imagine the annoying oscillation between browsers for default primacy, except that battle is now between language vendors, os vendors, device vendors, etc.