Well what do you expect? Everyone is on the business of making money here so its obvious that the main front (trading exchanges) will really profited huge amount of money since crypto has started to took off in the last couple of years. And its global, so it makes sense that a lot of money will flow on the bitcoin ecosystem. If you just check the volumes per 24 hours, you will be surprised as how much money is pouring in the market so I'm not surprised that they will eventually profit $1 Billion. But I hope they channel their funds to strict security measures to prevent hacks and improved support and infrastructure.