This same applies to exchanges as to Whirlwind: Not your keys, not your coins. So everyone can decide for themselves to take the risk or not.
They are the same, not your key nit your coin. But they are also different because mixers should just be for what they are called which is mixing. Anu other thing that will encourage people to deposit for long or investment on a mixing site is an indication of a scam attempt.
Another way that people can think of is when It is always better to get your coins directly in your wallet. I do not know if anyone complained about the chance? But this procedure is also often done at campaigns from casinos. Payout directly to the user account. It is always about trust. And Whirlwind has abused our trust completely.
That one is different. Whirlwind starts by paying to peoples self hosted wallet addresses until he suddenly changed to public key note. But the same people they are both custodial.