Yes, there is such a problem, but many exchanges do this, not just Kucoin. For example, on the Yobit exchange there is a lot of information and how its owners listing shitcoins and are engaged in their pump and dump, earning on their users. But do not be afraid, this does not greatly affect the price of a promising coin with great potential. Perhaps we should choose exchanges that accept payment for listing in ETH, BTC and then there is a possibility that there will be no such problems with manipulating the price and dropping all the coins exchanged for listing.