I wish to address the situation that lead to this meta question rather than the topic of the question.
It seems after chatting with the user that this question is related to my meta question here. The OP of this question inserted in a comment on this question links to a manga page on a scanalation site and a YouTube video of a complete anime episode.
In this case, the link to the scanalation site was replaced by an image of the page in question, which was relevant. The YouTube video was removed. These actions were performed by a moderator after I flagged the comment explaining that the comment itself was helpful but the links should be changed or removed.
In the case of the scanalation website, I think this was actually an improvement to the quality of the comment. The current image is more stable (being uploaded to Stack Exchange's imgur account, it's immune to link rot except in very drastic cases). It also doesn't require users here to visit a site of questionable legality to see the content. Because the comment was just referencing the manga and had nothing to do with the scanalation site, there was no loss in content. For on-topic manga references, these can and should always be done via uploading an image with the upload feature and linking to them with
[link text](http://i.stack.imgur.com/XXXXXXX). Even ignoring questions of legality, this style of manga references should always be preferred to linking to a page from a scanalation site for practical reasons, whether in questions/answers or comments.
The YouTube link was more questionable in my opinion. At first glance I could not see how it was relevant. I suspect there was relevant content there, but it was basically impossible to access because the video was too long. YouTube videos can be made to start at a particular point, which really would have helped demonstrate that the link was useful. Alternatively the user could give a screenshot of the relevant point of the video if it's a single frame. In any case, this link is more debatable than the other one, if only because YouTube is a more reputable site and the link was removed rather than being converted. I believe removing the link was an acceptable action mostly because it was not helpful in its present form (as a link to the beginning of the video rather than to the relevant point in the video). Another good option would be to find the relevant clip as a shorter video and link to that. If any of the above actions had been taken, I think the link could have probably stayed, but in its present form it was not useful and made us look unprofessional.
With all of that said, while the actions were justified, these are very understandable mistakes. Our policy on fansubs and scanalations is admittedly a bit hard to follow. As a general rule, links to scanalation sites should be replaced by uploaded images to imgur. Beyond that, so long as the links you post are in good faith, helpful, and aren't actively promoting copyright violations, they aren't really a problem in my opinion.