Aside from the observation that this is basically one half of a Tor networking connection, one might also observe MAYBE THERE IS A PROBLEM WITH THE SUPPOSED LEGAL OBLIGATION AT HAND, HERE:

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One practical outcome is that government agencies find it harder to identify criminals behind particular IPv4 addresses. According to Europol, access providers are no longer able to meet their legal obligation to provide details of the account holder linked to a given connection. Because, in some cases, a single IPv4 address is shared by thousands of users. As a result, the agency says, investigations often involve examining and tapping the connections of many more people than really necessary.

https://www.sidn.nl/en/news-and-blogs/cgnat-frustrates-all-ip-address-based-technologies

It continues:

In a document entitled ‘Resilience, Deterrence and Defence: Building strong cybersecurity for the EU’, the Commission explains how the EU wants to promote the adoption of IPv6. The ultimate aim is to have one user per IP address to facilitate the investigative activities of the police and security services. Procurement policy, research and project funding, and covenants will be used by the Commission in pursuit of its goals.

Here in the Netherlands, the Ministry of Economic Affairs is currently looking at ways of energising the country’s tardy migration to IPv6.

Sounds lovely…