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.
No body controls the market, the merchants are driving the prices. It all depends on the demand, activity, and the price that they are setting when trading. However, someone with a big amount can influence the price and the demand of crypto.