Citing the source is one thing but copy/pasting should be assessed on a case-to-case basis.
I've seen some users simply copy pasting news articles on coindesk and pasting them here without any attempt at discussion at all. If this goes unchecked pretty soon you could have bots using forum keywords to search for online articles to copy paste here.
I do think those users should be warned and/or punished.
Remember that spamming is posting without substance and if they're not willing to at least add to a discussion then the thread is pointless. It's like if you were to post a lot of threads in Economics about the bitcoin price, every hour. Useless.