Exchanges help us trade our coins. I guess there's nothing wrong with using exchanges. Binance is trusted; they are unlikely to scam you. They may withhold your cryptocurrency but they would only do that if they have a valid reason for doing so. I hate Binance because they are one of the stupid entities in the market but they aren't going to scam you. Well, if you mean using exchange as wallet, that's a big NO for obvious reason; Not your key, not your coins. I don't mind using a CEX but that must for trade only.