Afaics, all of these proof-of-storage/retrievably designs are fundamentally flawed (MaidSafe, Storj, Sia, etc) and can't ever be fixed.

They try to use network latency to prevent centralized outsourcing, but ubiquitously consistent network latency is not a reliable commodity. Duh. Sorry!

Sergio also the one who started the idea for a DAG which I have explained is fundamentally flawed (and afaics even had an egregious/fundamental error in this white paper for his DagCoin). Find that info in the thread linked above.