The problem is that, as A/I themselves explained (https://www.inventati.org/who/collective), they worked hard to ensure that they do not possess any evidence of or data about who is using their infrastructure.

autistici.org said the opposite:

https://web.archive.org/web/20260826145332/https://www.autis...

"We provide our services strictly for non-commercial use, in order to provide support exclusively to individuals or groups we feel we have an affinity with. In order to verify the existence of these pre-conditions, each and every service request is processed manually by one of our volunteers and is in a dialogical form. All requests are anonymized and will be destroyed."

Anonymized how? Before the first contact? After the conversation?

If anyone here wants to set up a similar service: This is patently stupid for an ISP to attempt.