Hmm, very interesting, crypto trading platform has existed already so I doubt that they haven't explored any methods in increasing the amount of users, Binance and other exchanges have reinvented themselves by offering ICO launchpad so that a good start. I'm not really sure that its a good move to contact them, they might even snub your for all we know. So you are in a dilemma, maybe you can give a try and pitch them your idea who knows, so goodluck to you!!!