It does make you think about such a high level on anonymity on part of Chipmixer yet they decided to use Cloudflare. Why would they do that if they were serious about anonymity?
I'm pretty sure ChipMixer never used Cloudflare. Actually, it's in the DoJ's case document that they were very much against CF.
While ChipMixer was experiencing DDoS attacks in September and October
2017, NGUYEN posted to BitcoinTalk explaining why he did not use Cloudflare, a popular
counter-DDoS platform, stating, In our case, if we would use Cloudflare, Cloudflare would
know input addresses and private keys. Cloudflare is US company so it is reasonable to think
that any three letter institution could get an access by court order.