Sure, you can sync to your own drives or to several commercial storage providers, but it's not as cheap as it should be. We're talking geographically distributed storage on an open marketplace, cryptographically enforced for extremely cheap prices.

Wasabi and B2 are pretty much the only commercial services which could even attempt to compete on price with something like Sia today (Filecoin and others in the future potentially), but they're only in single DCs and if they lose your data you have no one to go after. In the cryptocurrency-based systems, this is all automated.

For as many incredibly stupid and useless applications of blockchains as there are, this isn't one of them in my opinion. It may not be unique, but it's actually something that could have a competitive edge over a centralized service.