I didn't aware of this seize of Chipmixer until I stumble on this thread so thanks OP for this thread, DarkStar_ said he doesn't have any contact with Chipmixer in the campaign thread and also now its marked as ended so this is the end of bitcoin mixing services? Many reputed sites were took down by government for knowingly or unknowingly mixing the coins used for illicit purposes so the same goes for Chipmixer as well?
No, this isn't the end of mixing services. It will never be the end, whether deemed legal or illegal. Where one is taken down others will grow in it's place, likely Sinbad and Yo!Mix this time around.
I referenced this on previous page that authorities didn't publish that they requested information from bitcointalk, despite making a lot of references. At least, they didn't publish any evidence from any requests that is.
Maybe because the information that will be presented is not useful?
Indeed, this is the most likely reasoning that the information wasn't useful, rather than it wasn't requested in the first place imo.
The forum collects basic information such as IP addresses and other simple data that does not lead to a general failure to reveal identity, so I do not think that they are looking for such information, but they always go to email service providers, Apple and Google.
Bare in mind their entire investigation was based on IP and email addresses, as they used this to make connections to exchange/paypal accounts. So they wouldn't be requesting this information expecting to get a name and address, but more so in order to investigate that data and see where else it's used. Specifically a service that is connected to bank accounts or requests KYC, which is what they did.
Strangely enough, no data was reported from Proton's email, although it was the main email that the team used.
There was the following data, just not the messages it seems (as uses end-to-end encryption if not mistake):