Amazon is too big of an example. But look at Filecoin. They are trying to create a competitor to S3 -- a decentralized file storage service. Today, that is much more expensive and slower than Amazon's offering. But with all of the scaling solutions in the pipeline (sharding, alternative consensus algorithms like dPOS, sidechains, etc.), perhaps that will change. And I don't see why that couldn't be forked, in the same way that BCH forked from BTC.
Here's another example. Peepeth.com is creating a decentralized twitter, with IPFS for storage and indexing on the Ethereum blockchain. Since all that storage is open and public, the creater of peepeth.com is trying to build a business based on his front-end. People can freely create alternate front-ends or apps, and leverage the existing open database of tweets without being limited by Twitter's policy whims regarding its API.
Here's another example. Peepeth.com is creating a decentralized twitter, with IPFS for storage and indexing on the Ethereum blockchain. Since all that storage is open and public, the creater of peepeth.com is trying to build a business based on his front-end. People can freely create alternate front-ends or apps, and leverage the existing open database of tweets without being limited by Twitter's policy whims regarding its API.