I'm talking about a hypothetical mixing service that actually does everything right, which may also exist somewhere, no?
Yeah, that's exactly my point that proves o_e_l_e_o and BlackHatCoiner's goal is to scam users out of both their coins
AND their data. You can't possibly mistake these scammers for "Privacy Advocates" since the custodians they promote don't provide any privacy whatsoever, despite the option for these custodians to issue fully anonymous Chaumian Ecash.
Although I agree that centralized servers will always keep logs and ChipMixer kept the private keys in their server, but where's the data that those services actually didn't do their jobs in mixing their users' outputs? They probably did mix them, no? Because, with the sort of people that use their service, their admins would probably have more severe problems than being caught by the authorities. Plus why would they build their reputation and merely break it by not doing their jobs?
Stop playing dumb,
Let me stop you there. That wasn't proof that that mixer didn't do its job. In fact, ALL mixers might be at risk of getting seized by the authorities, and if some coordinators become a very popular choice - they will probably come after those too and invent "reasons" to stop them.