Of course you shouldn't keep funds on any online wallet. However, when it comes to one transaction, exchanges are necessary because not everyone has the option of F2F transactions. Of course, then it is better to choose the larger and more well-known exchange, but it is also often the case that the less-known coins are listed only on little exchanges. Unfortunately, then we have to take this risk. The risk is on every exchange, but certainly on bigger exchange is smaller. In this case it looks like someone is forced to use Coinsbit and just want to know opinion of other users.
Of course, large exchanges have more liquidity and seem more secure. But it is not always the case. We know that volumes of trades are bloated on almost all exchanges. This is often done not by exchanges themselves, but by projects using trading bots.
Plus, such exchanges as Cloinsbit that they feature many young crypto projects that do not have the opportunity to get on top exchanges like Binance and Huobi.