I'm not going to point any fingers, but I've come across several posts that list yande.re as their source and there are some users who are repeat offenders.
Why is this bad? Because yande.re is a site similar to Danbooru where art is posted from other places to make them more accessible to a western audience. They are not uploaded by the artists themselves. What's even worse is that yande.re doesn't anywhere near enforce the same quality that Danbooru does and more often than not there's no source link to the original or any credit given to the author. As such yande.re really ought to be banned as a source for art posted to Danbooru and approving such posts is either a lapse in judgement or just laziness. If there is a source on yande.re then it's easy enough to update the source link, but if there is none then the post is basically sourceless and the link to yande.re just makes it looks like there's a source at first glance.
I just now found a post that sourced yande.re and luckily this one actually in turn sourced a twitter post. So I updated the Danbooru post to source the twitter post and included the commentary. When I checked the uploader I found that this person had uploaded several art pieces from yande.re, some of which lacked further sourcing there.
I don't want to point fingers unless it's requested of me by a moderator, but I think something should be done about it.