The Financial Services Agency (JFSA) has published the results of "Research on privacy and traceability of emerging blockchain based financial transactions (20th March, 2019)" last Friday.
https://www.fsa.go.jp/policy/bgin/ResearchPaper_MRI_en.pdf
This is cooperative research by the JFSA and Mitsubishi Research Institute (MRI). MRI is a leading think tank in Japan, and JFSA paid them about $410,000 in research costs.
Unlike JVCEA and some exchanges that do not have many resources for research, it turns out that JFSA has done a detailed investigation into the anonymity of Dash and cryptocurrencies.
This research demonstrates that Bitcoin's Lightning Network and third-party mixing services are used for money laundering.
Page 70 describes Dash's PrivateSend. There is a description "it must be noted that transaction content (senders, receivers, and amounts) is not anonymized."
Also, JFSA has published reference material for this research in Japanese only (
https://www.fsa.go.jp/policy/bgin/ResearchPaper_Reference_MRI_ja.pdf). On page 45 of the reference material, "PrivateSend obfuscates the relationship between inputs and outputs by mixing and does not conceal addresses or remittance amounts. These transaction histories are visible to everyone on the blockchain, just like Bitcoin. Therefore, the level of anonymization is not as high as other anonymous altcoins.''