[owie829]

which would appear to be a violation of their terms:

If someone else might own the copyright to it, don't submit it. Outline is for reading pages that:

* you own the rights to,

* is in the public domain,

* constitutes fair use, or

* you have consent of the copyright holder.

[kazinator]

That's not terms of use; it's a feeble attempt to shift any legal issues onto the end user.

It's unlikely to hold up in court; the servers of outline.com and their owners will likely be deemed as creating the unauthorized derived work.

You cannot sue a hyperlink that's floating around in the wild; you cannot prove who created that link.