>>106350870
It won't be on all the time. They need you to look at it, so it will alternate between periods of being clear and having ads. Otherwise you'd mentally tune it out as background noise.
>>106349394
They tried adding advertisements to the floors of grocery stores for a while and only stopped because the machines that clean the floors were getting jammed up with debris flaking off the ads.
Now they're adding e-ink displays to the checkout lane divider bars so they can personalize ads on them.