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This was implemented way before Opera changed ownership, and as far as I can see from the outside, not much has changed in this code. The main difference I see, is that they have removed the source IP from the JSON.

So, if any, they are tracking less data in that data blob after they changed ownership.

(I worked on this feature at Opera back in the days)

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What was this information used for?

Statistics. We wanted to know how different campaigns worked, how the user retention from different partners was, and also benchmark how well the autoupdate system worked. While I worked for Opera this was strictly for internal use, and a very limited set of people had access to logs and raw data.

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