If users can buy and sell a coin only on the project platform this will enable the team to control the price, respectively, the coin will be stable.
But then the coin will become centralized and it is the team that will be able to directly influence the coin. Many users do not like centralized coins.
Not loving because of the fact that it is controlled and harder to make money on it, do i understand correctly?
Yes, if the coin is centralized (that is, most of it is in certain hands) it is easier for it to manipulate. But in fact, this happens almost always, no matter how they talk about the decentralization of bitcoin, but most of it (approximately 80%) is on several wallets.