I've written this before, and I'll do this again.
The first reason why we're this strict about illegal activities, is because we want to protect each and everyone of you.
We do not allow illegal content in a level because hosting illegal content can get your hosting service to be cancelled immediatelly without notice. Since Nifflas hosts this forum and J hosts knyttlevels (and also his trackmania database) having just one illegal file can get all that *poof* gone. No warning, no nothing. It takes one complaint.
However, since we put this stand so vastly, the chances for this to happen are smaller and smaller.
We do not have the time to check each and every level for illegal content, but there will be means to report illegal content inside a level if found. Also a disclaimer will be put (but that unfortunatelly haven't helped much. We have alot of read me first, rules post, blah blah, but there are always people not reading them.
So thats the reason why we're this strict for not having illegal content. Hosting it simply is one of the violations in the end-user agreement you sign when getting a hosting. It are in fact Nifflas and J's responsibility to prevent illegal content from being hosted. As Webmaster, I do that for him.
Now you say, but a link isn't hosting, right?
Thats true. And although I'm still against anything with illegal content, will don't think its necessary to complain against illegal content when the file itself isn't hosted on our servers. There are sharing sites that use the same principle.
However, if we get a complaint from a third party who claims to own the rights to some of the illegal material, your level will be erased directly. Even if your level had such good rating and alot of comments... it'll be *poof* gone. Not even a moment to alter your level.
Conclusion: When the file is hosted on knyttlevels.com directly it cannot have illegal content, and upon finding out by anyone, it gets removed. If you host the file elsewhere, I still don't like it, but as it is less threathning to the website(s) it will be tolerated unless its necessary to get it removed.