There are exchanges tokens in their numbers and we are seing them on several occasions serving a prominent investment to take all because they are being introduced by an exchange we are using, but that doesn't guarantee the authentic performance of such token, we may have to run some checks underground in knowing the exchange and it's tokens in details before going for them, because they all can't be the same.
Most CEXs have their own tokens: BNB, HT, KCS, GT, LA, IDEX..., and even DEXs have their own tokens: UNI, CAKE, BAKE, QUICK, JOE... The goal of these tokens is to provide users with exclusive benefits, making them more attached to that platform, so this is completely normal and reasonable.
Some CEX tokens are supported by their own blockchain platform but only a few are successful, such as Binance's BNB. Investors should carefully research the information about the token and CEX on Coinmarketcap to select the most potential CEX tokens.