What are apps centralized that need to decentralized on eth btc Blockchain?

We are currently in the midst of centralized services such as Facebook Uber and Google that would ideally be decentralized to serve the users and the web better

What are nonobvious centralized services that need to be decentralized on the eth Blockchain for anonymity safety and the health of the web

What are apps currently centralized that need to decentralized on eth btc Blockchain ?