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Edit:
More interestingly perhaps, this allows Amazon to bypass the tracking restrictions at the platform level (say enforced by Apple, and has harmed Facebook).
Dropping to the network infrastructure level may make attribution and tracking on Amazon Advertising best in class across not just Amazon.com, but other properties? I don't know enough about the space so just musing, but I can't help feel this is a major development that's a bit more than Prime members now get more free stuff.