It's not about trust, Binance has been hacked already so why would you trust them? It's about Binance liquidity, in my opinion that's why many traders are still with them ever since the beginning of that exchange. And even though it's decentralised as hell, people tend to go there because almost all coins are listed in Binance.
But there are a lot of good exchanges as well, specially DEX that traders need to look at specially this 2020.
It's about convenience while using binance, while it got hacked already but no funds of its users are affected, no one lost their funds at least for the team. Though there are good DEX out there like bisq, still they are feebler compared to other centralized exchanges because most of the reasons, liquidity.