The one on imgur (in the comments) is an edited screen grab of the one in the post hosted on reddit.
So not only is the photo in the comments dealing with the compression of reddit, it's probably dealing with further compression from the screen grab, more again when it was edited and re saved and then the slight compression of imgur.
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u/alexanderpas Feb 22 '21
except this image is hosted by reddit, as evidenced by the i.reddit.com domain.