First of all, AWS is very very expensive and tries hard not to compete on price with other players. They are there to make high-margin profits, not to give you

First of all, AWS is very very expensive and tries hard not to compete on price with other players. They are there to make high-margin profits, not to give you efficient and resilient storage. They don't actually care about efficiency, to the point, that they probably aren't even doing reed-solomon yet. Second, hardware-level reliability doesn't actually matter for any distributed storage, reliability is achieved on the higher level with software. It's all about software. Decentralized global internet network is also better than any centralized equivalent, it has orders of magnitude more capacity and resilience. Ever noticed how bittorrent can saturate any link and how even google global caches sometimes have problems serving youtube videos for like months? Other than that I don't believe decentralized laptop/desktop storage could even exist, for the same reasons why people don't mine cryptocurrencies on excess capacity on their laptops/desktops in the background. It can only be attractive to run it on dedicated storage nodes working 24/7 with good bandwidth.