But the point is that Vivaldi saying:
We anonymize the IP address of Vivaldi users by removing the last octet of the IP address …
is funny. It’s not much of an “anonymization”. The first three octets of an IPV4 address have a name: It’s called the “Network ID”.
Furthermore, forcing an IP change doesn’t help much either because, if you recall, Vivaldi also says:
When you install Vivaldi browser (“Vivaldi”), each installation profile is assigned a unique user ID that is stored on your device. Vivaldi will send a message using HTTPS directly to our servers located in Iceland every 24 hours containing this ID,
In other words, Vivaldi potentially saves the “unique user ID” along with a history of these possibly changing Network IDs.