If I am not mistaken, the mixer has function to define how much you want to get out and on which address so 123 in from address 1, 100 out to address 2, 10 out to address 3, 13 out to address 4, if there is 1000 transactions daily, it gets a bit messy to match input and output. Only real issue would be if you deposit 10k ETH to pool with 100ETH, then it would be hard to go unnoticed

Edit: HN destroyed formatting