This is a very stupid move and it might lead to the hacker being caught a lot quicker. A mixer service takes your coins and mix them with other people's coins, but the larger the amount of coins being mixed, the higher the chances that those coins might be mixed by the coins being send. It is rumoured that mixing services are less anonymous with larger amount of coins being mixed. 
Indeed, for sure Chipmixer will cooperate to the authority to trace the hacker. I believe Chipmixer will protect their name and will have a wise decision regarding this incident. Mixing service have records of their transaction though they keep it private.
So let's hope this backfires on them and that they dug their own grave by doing this. 
The companies tracking these coins, might just have received a jackpot from these hackers bombarding a single mixer service with a lot of coins. 
The companies tracking these coins, might just have received a jackpot from these hackers bombarding a single mixer service with a lot of coins. It will definitely backfire to the hackers.
