I think I've seen whales did that, they've spread a lot of bitcoins for different addresses through batches.
The purpose of mixer was not for money laundering and it to provide people the privacy they need which is the reason why they are legal not because hackers seized the opportunity of using it.
And what if it was used for laundering. It's not the fault of the mixer that someone uses it to commit a crime.
Right.
Not the mixers fault, it's used in general for the privacy and anonymity of the users.