Yesterday I down-voted the answer https://tex.stackexchange.com/a/343572/177954 because the websites where the images are from are not disclosed. I left a comment explaining this.

Today I noticed that my comment was deleted. Why is this? When I down-voted there was a pop-up that asked to leave a comment explaining the reason, that what I did.

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    The image in the now deleted answer seem, with great likelihood, screen shots. There's no need to give credit or cite sources for screen shots from one's own machine. – egreg Jan 23 '19 at 15:59
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    @egreg The screenshots are not from the machine of the OP, they were taken from another website. If one takes images from other websites, one needs to give credit to them! – user177954 Jan 25 '19 at 10:46
  • @egreg Another example: tex.stackexchange.com/a/412152/177954 does not disclose that the image is taken from wwwu.uni-klu.ac.at/magostin/img/cirkuit2.png Making other people (proved by your misunderstanding of the situation) believe that an image is one's own work, while it was created by others, is utterly wrong (and might even infringe the terms and conditions of using the image upload dialogue) – user177954 Jan 25 '19 at 12:53
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    You're wrong. The site is cited and the image is seen in the linked page. – egreg Jan 25 '19 at 12:58
  • @egreg The site is cited in a general context, not as source of the image. – user177954 Jan 25 '19 at 13:00
  • @egreg Also uploading an image with questionable permission rights to imgur is not right – user177954 Jan 25 '19 at 13:01
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    This is hair-splitting. Anyway, I still consider that downvoting is inappropriate. Flag and leave a comment asking the poster to disclose the sources. This will make the poster aware of the situation. – egreg Jan 25 '19 at 13:05
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    @egreg No hair splitting, just respecting the work and effort of other people – user177954 Jan 25 '19 at 13:11

We've had a few comments on that particular answer. Issues about 'legal' stuff are best handled by flagging rather than voting (a downvote indicates the answer is wrong on a technical level, rather than having an attribution issue). After looking again, I've remove the answer entirely.

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