Not actually conquered but they do able to gain the top tier ranking when it comes to exchangers but just to say that each exchange would really have the chance to get the spot when they do
offer better service among any other exchange (UI,Support, Security, Fees) These are things that most people do always check out and if they do saw that it do suits out their needs
then the hype and popularity would build up.Look into previous years how Poloniex,Bittrex, Bitfinex are on the top spots.