If you mean using exchanges (of any kind) for attempting mixing bitcoins, it's pretty easy to do it wrong.

Some of the exchanges may keep logs of the transactions, even they say they don't.
Some of the exchanges may keep logs of the IPs, even they say they don't.

It's not easy to do privacy correctly nowadays for Bitcoin.
My take is that if you indeed want privacy, just stay in Monero ecosystem. If you want to do good investment, use Bitcoin.
If you mix them you can easily get something worse than you'd expect, whether you'll know it or not.