Well since OKEx is run more than years many users is trusting them but I think using as piggyback of your assets I think it's not right to store it there just gain a profit. But of course its up to every user if they want to invest it not just store it to exchange forever. Because you don't know what will happen even the exchange is trusted and good security support much better to store your profit immediately in a hard wallet to be safe.
right . exchanges are online and expose to many risk . they can be hacked or worst they can turn into scam one day but im not totally saying they are , i just only found simillar cases that happend on the past . the idea of storing fund to earn interest is cool and yes you can treat it as a piggy bank because a piggy bank only means that you only put small or excess funds ( not your whole liftime saving ) so for me , its not a big deal overall .