Because if the increase in popularity of the Binance exchange, BNB is also getting to be known and widely used hence the price keeps increasing, but to talk of it beating Ethereum, I am not sure that will happen anytime soon
it's hard to beat Ethereum, because Ethereum is the best and the best Altcoin so it's not easy to compete with anyone.
it's a good BNB coin and many people now recognize it and its value is pretty good too, but Ethereum also doesn't stay silent, he also grows better and better so he grows and increases, chases and gets away.