I read the Storj whitepaper a while ago and don't recall the details. But I read the Sia one recently and the cryptoeconomics of Sia suck big time - it attempts to match storage providers to storage consumers in a peer-to-peer network ("bitcoin for storage").

Which can be useful if you try to store controversial material ("censorship resistance") but it is hugely inefficient.

On an unrelated note, you only approve 4 witnesses - it costs exactly 0 (zero) to pick another 26.
Highly appreciated if you'd pick @lux-witness (it's only a couple of clicks to do it). Thanks in advance