I think a decentralized web is easier than what people think. In the early days of the web, users could host their creations somewhere in their ISP's hard disks

I think a decentralized web is easier than what people think. In the early days of the web, users could host their creations somewhere in their ISP's hard disks. The same model could work now, with a small difference: instead of storing only data, it may also host applications that manage those data, and collaborate with same/other applications of same/other users. For example, a photo app could allow us to manage our photos at a specific host of our choice; the same photo app uses a sharing protocol so as that the photos are shared with other users of our choice. The stored data are encrypted by our own keys and therefore not visible to third parties, we still get to share our stuff with our mates, it's decentralized because no central authority can lay claim on our data, it's protected because it is encrypted for us, but the infrastructure required for this to run is provided by a centralized entity.