It's best to write as few as possible on here in order to not violate some hidden rule, it seems. I do not really appreciate that feeling.
It's not a hidden rule, plagiarism was always a bannable offense. People who pass off other users' posts as their own tend to do it on more than one occasion. Imagine what the mess the forum would be if a lot more users were to spam it with copy-pasted posts, inevitably scaring away worthwhile contributors.