Remember, this whole thing about crypto is largely decentralized, thus, there is no single authoritative body in control of the crypto market. Although there are few centralized platforms among crypto, the market is largely influenced by the efforts and influence of the users of crypto. How well sellers and buyers treat the coins on the market affect the performance of the market.
It is right nobody controls the cryptocurrency market, but some big whales have been holding a large amount of coins, so they have got the power to influence the market in their own favor. There have been instances when the whales have skillfully manipulated the market, so they would always have influence on the market, but they can't fully control it.