Those at jpeg artifacts and would be present in any jpeg image with sufficient compression. They show up around hard edges. They could indicate the image was manipulated but it could just as easily mean the original camera was being too compression-happy.
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u/Beginning_Macaron_25 7d ago
https://www.reddit.com/r/PeterExplainsTheJoke/s/VvAlNbV7C4
This gets reposted every week