It's easy really, The reason we trust Binance because of it's rating and popularity. There's just a slight chance that BNB is turning against us. What if Binance is a scam? Well, If it is. Then it will shake the whole crypto world. It's like one of the main foundation of a building. Remove it the building goes tumbling down. Why? Because binance right now is the #1 coin and they own CMC. So if they are not legit. Why bother buy CMC? To get more attraction and scam people on the long run?