None of these are "the decentralized internet", since "the internet" is already decentralised. IP -- Internet Protocol -- is a "internet layer" protocol. Most of what you mention is at least based on the application layer (not sure about Xandu, but is that really in the same category?). As such they are all different attempts, in the same way as the "centralised internet" is too disperesed (youtube, facebook, twitter, ...).
To put it differenly, if you want a decentralised twitter, you won't be cconsidering the Blockchaon or Xandu.