Please... This is nothing more like an announcement of the OFAC listing and by it's no means detailed. By detailed I mean something like this:
https://www.justice.gov/opa/press-release/file/1574581/downloadThe only difference with Chipmixer though is that the authorities are very quick to take action against Sinbad.io. Chipmixer was able to be under the radar for many years, maybe 5-6 years before it was seized.
Because of bad security practices, probably even worse than Chipmixer's operator had. Having some basic security considerations like proxying your end server via clearnet reverse-proxies over Tor to avoid the whole operation seized is something that even a beginner .onion site operator would know to do. There is no excuse for someone operating a mixer to have their core (backend) server seized as there are many ways to hide it from cybercrime investigations even without recurring to offshore hosting. Having a few servers and basic network routing skills would be enough.