Hackers may have no business with coinomize, but many mixers cleaned a lot of hackers money in the past.
That was probably the most famous case. Chipmixer r3ceived nearly 5000 btc hacked from binance
Mixers are one of the options for hackers to launder the illegal crypto they seize from victims. The advantage of Mixers can be abused by criminals, just like roads can be abused by bank robbers 
This is often used by politicians to accuse and try to ban Mixers. However, compared to fiat, crypto is not yet really popular in the field of money laundering, the government should ban fiat if they also want to ban mixers!
Fortunately, Coinomize has not been involved in any serious money laundering cases involving hackers, we can still use the best services from Coinomize.biz.
I think that hackers most used options is how to spend their stolen tokens which may be limited to exchanging the stolen token into Fiats.
You see, the end purpose for hackers is to convert this token to fait, which is also a major reasons they engage on illegitimate activities.
Like i said before, mixers is purely on anonymous purposes, but many people that concluded that hackers will patronize mixers to launder their stolen tokens, should also considered other options which may be the most prevalent, like converting to faits through P2P, or Dex Exchanges
It is obvious that we have mixer like Coinomize biz which has maintained a cleaned records in anonymizing Bitcoin transactions for many years.