Well are you surprised? Due to the high fee that rocked the Bitcoin network few months back so many users here actually changed their payment address wallets to exchange wallets and so many people out there still very much used binance exchange to actually save their coins whereas exchange is meant for only selling of your coins and nothing more. We have seen so many cases of how people actually lose their coins due to one or two issues concerning exchanges so it's very much safer that your coins be in a non-custodial wallet than an exchange
There was this issue a friend of mine faced over the weekend, he tried to consolidate his coins in a single exchange wallet and send it back as a single transaction to his non-custodial wallet. As he sent the funds, the exchange imposed a 10% tax on him to send the funds to his electrum wallet which made him spend his holdings on his needs and not yearn to the robbery of the exchange. Saving your coins in an exchange to gather it together is a very high risk as the funds may be lost in case of the exchange winding up, or the transaction fees they might charge will be too high for you to bear, I had an experience using my OKX exchange to sell coins through P2P where I was made to pay transaction fees just to move my coins from my wallet account to my exchange account, still in the same platform.
You are not safe with an exchange, if its not your keys, its definitely not your coins. In the case of my friend above, you can consolidate your coins in a non-custodial wallet and when you have gathered enough and is set to transfer it as a single transaction, you can send it to another non-custodial wallet, or even within the same wallet provider as such transactions fees are relatively cheaper compared to dealing with an exchange.
But the funny thing is that in as much exchanges are not all good in saving of coins, people still keep their coins there and some of the folks that keep it there is not because of anything but due to the fact that you can actually buy Bitcoin with a non-custodial wallet so people that don't earn Bitcoin as a means of payment through their work still have to buy and gather their so that when sending it out the fees won't be the same as per sending on every single time when you buy Bitcoin especially those that are hoarding BTC through DCA strategy.