This is good news and takes away a big argument of the central bankers against blockchain. Not that this has ever been a real problem as studies show that the use of cryptocurrencies for illegal activities is minute but knowing know that even those can be tracked and traced back to the person will further discourage the illegal use and help mature crypto assets into a globally accepted technology and monetary instrument.
Here is the report of the Qatar University where they demonstrated how Bitcoin transaction analysis can be leveraged to de-anonymize Tor users:
https://arxiv.org/pdf/1801.07501.pdf