[ConcernedCitizen]

Seems most likely a participant cooperated and handed out the chat logs. Like the article suggests Signal is horrible for anonymity since it requires a phone number and still hasn't implemented usernames

Regardless what's happening here and sorry to spoil anyone's expectations but - don't do illegal shit on networks and the runners of said networks won't feel obligated to protect the other users by turning what information they do have into the authorities. It should go without saying. But I said it. And that's the reality of Signal, as they've demonstrated before. That or the government will fine them $10k/day for not giving information and possibly shut down the services, ruining it for everyone.