It sounds like this Web3 space is not decentralized at all. With those 4-5 crypto exchanges we cannot talk about bulding real businesses on those technologies, we are super early.
There are very few successfully distributed systems I can think of. Bittorrent is on. I guess we could argue some markets in the economic sense are distributed. But in reality even both of those are part-centralised.
Just turns out centralisation is usually more efficient and more convenient.