Why rewrite is also prohibited? I ever rewrote someone else article once, and my work rejected.
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Why is writing in my own words not allowed? I took some text written by someone else and changed it, but my work was not accepted."
Do you see what I did there? If you can't add anything on your own, you're not adding value by producing more text with the same purpose.
I would say that this, at the very least, is a grey area. If you class completely rewording as copy pasting, then 90% of the content on the forum would disappear - not that that would necessarily be a bad thing. The example you have given above would not, in my opinion anyway, be viewed as copy pasting. However, I do agree that when rewording, it should be common courtesy to cite the source and preferably add even a touch of personal opinion. Can be difficult if you just happen to have the same opinion as someone else though. I found a few copy pasters that have used posts of mine to create their own, some of which took it word for word and tried to pass it off as their own opinion. Only happened to catch one because it was in a thread that I had started, so was going through and checking it out, I'm sure there are plenty more. Either way, it is a frustrating (and unfortunately inevitable) aspect of a popular forum, just have to keep an eye out for transgressors and report posts when you spot them. Good to know that the rules are being enforced anyway, banning is (hopefully) an effective way to discourage the practice.