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If you take a frame you see it's neither random nor dots:

https://i.imgur.com/CgtyGjl.png

From a single frame you can definitely identify boundaries because the dots are sliding and get truncated.

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They are the boundaries of the decoy, I think. I can sort of make the decoy out in a screenshot.
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Exactly. It's a good idea, badly executed.
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Maybe not so well explained, by picking the default intended text presented to be the same as the decoy text. It took me also some time to realise what was going on, but the execution is fine otherwise.

So there are two texts, one decoy (which you can barely see in a single frame but becomes more clear if you average between frames) and an actual text, which disappears in single frames or averaged ones.

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Just to add some drama - this feels like a perfect competition between humans & bots!
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"Content not available in your country" - obviously working well.
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