On our own Meta I've just highlighted something that happens with link-only answer on Ask Ubuntu: user posts link-only comment, reviewer uses an auto-comment to tell them off and the user copies the entire page into their answer... And that usually means the moderator has to nuke the answer from orbit.
It's a horrible paradigm because not all link-only answers are immediately useless (certainly not to the asker), and with enough time they can often be rewritten to create something transformative. My thread on Ask Ubuntu Meta is seeking to improve our pro-forma comment but this applies to the entire SE network and really is something people should be able to read about in the site documentation.
As a moderator and a reviewer I need to be able to point at something that explains:
- Why we need standalone answers (links rot, etc).
- Why we can't accept swathes of illegitimately copied text.
- But also why some copying is great (compatible license or it's within fair use).
It doesn't need to be exhaustive but it needs to introduce people to concepts like fair-use and to point out what is and isn't acceptable copying.
/help/referencing would be the page I'd expect this content to have appeared but I'd happily see a new article just about Link-Only answers and how to improve them.
As Ilmari just suggested in response to my Ask Ubuntu Meta question, if it's too hard to talk about copyright accurately, should there be more focus on making users paraphrase things into their own words?
Even without mentioning copyright law, I think you could improve /help/referencing with more focus writing original content rather than copying. Perhaps a fourth bullet-point.