CGNAT means multiple people are using each IP address at every point in time. To disambiguate customers the ISP would need to log every connection, which is a h

CGNAT means multiple people are using each IP address at every point in time. To disambiguate customers the ISP would need to log every connection, which is a huge amount of data to keep track of and only useful if you have not only the IP addresses and timestamps but also the peers' port numbers.