If Chipmixer was so flawless, how did people know those funds were sent there anyway?
It's trivial to know that. If the money are sent to an address that is later used as input with a list of inputs multiples of 0.001, it's likely to be them. I know no other mixer that works similarly. Knowing that I've sent money to a mixer is a feature, not a bug. The point is to obfuscate. It's a clear sign that you can't make a valid assumption about my inputs, because it's crystal clear they belong to a mixer. Same goes for Coinjoining.I dont agree with your line of thought that those $400m werent owed to customers and I still say if you lost funds on FTX, you should thank Chipmixer advertisers for supporting the theft and attempted laundering of funds owed to you.
If you were registered at FTX, you didn't have any funds to begin with. 