Not whole of tokens are listed on binance and they have no choice if their coins have already traded on another exchange site. If binance doesn't listed its token and can they trade it? That makes sense why so many people are still using another exchange site.
we can see more and more existing exchange platforms. lots of exchanges of course they will always compete to get traders. because the life of the exchange is a trader, when trading activities are in a crowded exchange, it will increase the volume of the exchange itself.