Thoughts on Bitcoin

"Decentralization" in technology is not the same as "decentralization" in reality. A large number of bitcoins in the world may be controlled by a very small number of hundreds of people. These hundreds of people can unite to control market trends, and because of the anonymity of bitcoin, they may not be punished. Technical "decentralization" may instead ensure absolute "centralization" in reality.
The essence of the blockchain is a P2P distributed network, and it is almost impossible for the distributed network to be completely decentralized. Also consider the potential security risks of the blockchain.
There is much speculation. What pushes Bitcoin and other cryptocurrencies to the forefront is not the participants' expectations that they will become the currency of the future, but to follow the trend and treat them as pure speculation and hype. From this point of view, the credibility of cryptocurrencies now has to be questioned.
Are there other application scenarios for blockchain? In addition to the cryptocurrency system, are there other application scenarios for blockchain? What do you guys say?