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Ethical Reasons

@Unabart @sandofsky This depends on the direction of polarization. The LCD panels that replace vertical advertising boxes at bus stops (at least here) have their polarizers turned by 90 degrees relative to normal displays due to the panels being mounted vertical instead of horizontal.
This results in them being blocked out by those glasses, while all the useful displays are not even dimmed by these glasses.

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Ethical Reasons

@Unabart @sandofsky Downside is not being able to use your phone when rotated.

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