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It happen with all and it can happen with Current ones
e.g the last one KuCoin like 7 Days ago two of its founders were charged with violating anti-money laundering laws by U.S.
Be smart and keep your assets SAFE always use a Cold Wallet Your Keys Your Coins
Does this concern you ?
With raging fees, it can be hard to move the funds in & out of cold wallets, so it's cheaper to hold the coins in a trusted exchange. It can be risky, but those with money in Binance exchange have never lost their funds. And I think that Kucoin users are also safe.
What's happening with Kucoin founders is probably the same as what happened to CZ. He was charged, he paid the fines, and now he is free... Binance is still operating with a new "boss" and that's it. So we can assume that these two Kucoin founders will have the same destiny.