They do that since they are lazy and want to increase their post count then try to earn a merit out of that. And that is bad action done by newbies so this is one thing need to avoid since we will just waste our account if we did that thing since plagiarism if one of the concerns which is always pointed out by other forum users who report it. Anyways as I see it seems the plagiarism act is lessen maybe the effort of those reputable members who spend their time to do a research and report it to the mods contributes for its elimination.
Like, forget your accounts lol. Don't commit plagiarism because it surely sucks to get your hard work copied and taken as someone else's. Writing great solid content is hard enough to start with.
Indeed that's why its never be a good idea to do that since the original poster will be the rightful one pointed out to be the real one and the copier will given a punishment for doing that, Imagine how hard to rank up these days and we will get ban for doing plagiarism so to avoid this better write our own personal contents since for sure we will get those merits if there are members like what we post here.