I do not understand how you can make content that looks like YouTube, but decentralized? I do not think that such content is possible for ordinary users on computers? It is not productive. Can the term "decentralization" mean something else?
And what's the difference, will you use it on a computer or on a smartphone? All you need is go to the resource by its address. All for you will make a browser, or a special application.
The main task of decentralization is to remove the intermediary in the form of a server when connecting devices. This technology allows you to combine all devices into a single file system.