Binance seems to serve its users in the best possible way, and that on all grounds.
Binance is one of the main reasons other exchanges are losing market share because of how traders will always follow the highest volumes and the most liquid coin pairs, and Binance exels here.It's actually quite fascinating how Binance has managed to floor more than half the market in such a short period of time. Out of nothing it popped up and started dominating the market with iron fist.
The only downside to this is that it is heavily centralizing the exchange market. One blow of Binance will shake up the entire market. It's quite a scary thought, but thus far they did it right.
Yes, you may be right that other exchanges take part of the market, but this does not mean that little-known exchanges do not have great prospects. For example, Poloniex is much better than Binance, but inferior to Bitrex. A lot of exchanges and hitBTC can not fall for this reason.