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.
Super early, or... such systems tend to centralisation.
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.