well, not specifically ethereum but stuff like siacoin provide cheaper options than AWS and while I personally cannot attest to the performance, they seem to be interesting alternatives.[1]
In the case of siacoin, at face value it seems to be significantly cheaper than AWS or Google Cloud for providing bulk cloud storage.
Even more exciting for me is IPFS and Filecoin. Seems like this pairing could allow for a truly decentralized Internet. Ycombinator had one of the founders / lead programmers on the podcast in the last few weeks and I highly recommend it!
siacoin is relatively slow, it took me ~2 minutes to upload 40mb of stuff. But really it's meant to be cold storage and at $2/mo/TB it isn't that bad. The speeds will also increase with adoption.
In the case of siacoin, at face value it seems to be significantly cheaper than AWS or Google Cloud for providing bulk cloud storage.
[1] http://sia.tech/