I am currently getting several members evade this system without even trying (one simply re-registered and publicly announced that they are back, yet it didn't register anything in the log), so I am wondering how this might happen?
When I used the Xenforo platform there was a similar Mod which operated by installing a cookie on the device, as well as checking if the IP address was duplicated. The option was up to Admin which of these criteria to use.
It worked seamlessly for many years.
The IPS IP address checker is time consuming and not extremely user-friendly, unfortunately, which is one of the reasons why I began seeking out an add-on like this.