I believe is just some technical problem on their system...
One of the possible reason maybe they are having a technical problem these few days, and I suspected that because on
this topic that they are facing now. It is bad for their reputation to help scammer on Binance tumbled on chipmixer. I don't if $200 worth of bitcoin will enough for them to exit scam that Op accusing(probably not).
Anyway OP, are you sure that you are in the right link of chipmixer? or you are fall in a phishing site?
On a very different note than OP, I want to ask you that if you are offering a service that is usable Independently by anyone, how can they keep a watch on people who are using their services to tumble the coins for a criminal cause? If it is brought to their attention then I don't think that Chipmixer guys are the ones who will favor the guy. I have used their services once and I can say that they are punctual at doing their job properly. This thing that OP is facing might be due to them having issues with what happened and so they could be stopping users for some time till their services resume to work normally.