Depends on what their goal is. I shouldn't have to explain why a "library" that's operating illegally in virtually every jurisdiction, with few or no complete mirrors, is vulnerable to being shut down by a small number of governmental or judicial entities.
If I were running the archive, not being a single point of interdiction would be high on my list of priorities. Especially when any number of people are indeed willing and able to keep 1 PB+ of content in circulation, samizdat-style. I would work to find these people, put them in touch with each other, and help them.
Beyond that, and what I was getting at earlier, is that maintaining a 1PB storage array at home isn't exactly easy, or cheap.
Not everything that's worth doing is easy or cheap, or otherwise suited to "average people." Again, I don't know where you're coming from here. What's your interest in the subject, exactly?
And my point is that this is an absurd suggestion. I shouldn't have to explain why a shadow library shouldn't be selling (tens of) thousands of dollars worth of hard drives containing pirated content. Beyond that, and what I was getting at earlier, is that maintaining a 1PB storage array at home isn't exactly easy, or cheap.