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Demdex is a DMP from Adobe that is used by companies to manage their first-party data so this particular example with Chase is very likely not an example of third-party ad serving abuse. Chase would have presumably put Adobe through a security review during an RFP process and would have no reason to harvest their own customers' login credentials. Their use case is probably something benign like wanting to segment customers for targeting based on their site usage patterns. Chase has different login pages but the one I'm looking at doesn't appear to have any third-party JS loading from advertisers.

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