I tried to make a post with the https://species.wikimedia.org/ link, and I get "Your content couldn't be shared, because this link goes against our Community Standards".
Being generous, it could be there's NSFW imagery in there? I can't be arsed to dig into a mountain of scientifically named links, but you can find troves of pr0n among other things in Wikimedia if you know where to look.
(I'm not sure why my comment is now collapsed by default. It doesn't seem to be flagged, and has a score of 15.)
I tried again, and this time I get "Posts that look like spam are blocked", and a similar message if I try to leave a link in a comment.
I wonder if spammers have been vandalizing Wikispecies and posting the links, but unlike Wikipedia the editors of Wikispecies struggle to remove the spam in time? The project has hundreds of thousands of pages, but the vast majority would have very little content or oversight. It could be the Wiki project with the worst pages-per-editor ratio.
I guess if they blocked *.wikimedia.org to get at commons.wikimedia.org that could make sense. However all those images are also accessible via an en.wikipedia.org url.
Thank you for actually spelling porn. This whole thing around altering spelling to avoid blocking which I presume comes out of other apps has gotten to be quite annoying.
It absolutely came from censorship. IRC chat rooms and PHPBB message boards with blacklists of words that would get starred out. Hoping it wasn't implemented with substring match so typing "shell" didn't come out "s****".