You listing out a bunch of decentralized, protocol based solutions means that there's competition in the market, which is evidence of a new market that is GROWING. The opposite of a dead market. Youtube is also a the result of such a competitive market. There used to be dozens of video hosting platforms. The same applies to almost every other company. Facebook, Google, Amazon, Ebay, etc. all grew up in very competitive markets. Competitive markets means that there's demand.

Decentralization does one very important thing. It makes it more profitable, and cheaper to make content accessible to your audience, while giving you the freedom of making money. That is to say decentralization amplifies the ability of computers to make work what Youtube and Google require billions to do. It DISTRIBUTES that workload among many independent workers, and lets the market decide how valuable their input is.

Secondly centralized solutions can exist in a decentralized environment. Content distribution should always have been decentralized, making profit on content is the centralization problem. You're getting content distribution, and profitability mixed up.