The same answer when ask the same question to bnb, okb, kcs, ht, and many more. No real use case if you take the token out from the platform, but it gives more benefit inside the platform.
Let me quote some words of this tko
The TKO offers a unique hybrid feature by combining the advantages of both the Centralized Finance (CeFi) and Decentralized Finance (DeFi) model
Exchanges build up their products to get income. The better the products they provide, the more attractive for customers. The higher income from operations they will achieve consequently.
Tokens are create to force users use those tokens to get cheaper trading fees and with connections to Binance, they will have rights to apply some wise strategies from Binance. This token will rise with time and the support from uptrend is big.