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I would be fascinated to know if “optimize for Chrome data saver mode” has ever been included on a ticket or epic anywhere.

Not exactly the same, but regarding a slightly similar setting in browsers. I had problems getting some 3rd party widget working in a webpage.

I had enabled 'Do Not Track' in the browser, which broke the widget.

I'm sure the 3rd party provider regrets listening to the privacy nerd who insisted on supporting this header.