and this coin can only be use in there palform no real use cases in other thing unlike ETH .
You are wrong, there is many project moves to BNB chain, if you think no real uses, you need to make a research about projects was swapped to BNB chain. I give some example, Mithril from ERC20->BEP-2 standard, Fusion, DeepCloud and more.
In the positive side due to binance dex there's project who already switched from Eth chain to Binance chain. Competitions between platforms is good to see around the market, it's a good sign of healthy industry that we are inside, there's no certain assurance though that even there's projects who switched it will surpassed or overtake the position where ETH still holding.
The future will decide if what possibilities to happen lets all observe and believe whatever we plan to support between the two.