https://arxiv.org/pdf/1704.04299/
The problem is also one of credibility, Bitcoin was supposed to be private and breaching privacy has proved to be pretty trivial. Encryption is hard, but maintaining anonymity is much harder.
From the paper - "Our techniques show that Monero is not necessarily a dead end for investigators."
And then offers zero evidence to demonstrate that investigators were able to use anything from the seizures.
This is not evidence - "They (mistakenly?) advised their hopeful subscribers to publish their email addresses (hexencoded, but publicly visible) in the Monero blockchain, leading to these transactions being identified" [31]
[31] - https://steemit.com/shadowbrokers/@wh1sks/ theshadowbrokers-may-have-received-up-to-1500-monerousd66-000-from-their-june-monthly-dump-service
Link is broken - where is the evidence that 1500 XMR was transacted?
https://www.getmonero.org/2018/03/29/response-to-an-empirica...