[mediaqueries-5] Privacy concerns about the prefers-reduced-data media feature

[frivoal]

As noted in the Privacy and Security Considerations section of mediaqueries-5, the prefers-reduced-data media feature may be an undesired source of fingerprinting, with a bias towards low income with limited data.

Is the tradeoff worth it? Can the downsides be limited? Can a different design address the same use case without compromising (as much?) on privacy?

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cc: @fantasai