So here i am discussing about the disadvantages of copying content-
we know google king of source of traffic so if you get the 1st page rank for any rich keyword then you will get millions of visitors per day for free. So if your web content is copy written then as soon as you get the 1st page rank by doing high quality SEO then google will vanish your page from the 1st page for copy written content. So then you will lost your blog traffic and that's a red alert for you. And if you use google adsense then google may banned your adsense account.
I will advice you to make a blog in which you have more knowledge.
At last I want to say one sentence-"Don't Copy the sentences but you can take the ideas and write articles yourself"
So I think I have given you a clear idea about Disadvantages of copy writing and advantages of self written content. Any question pls comment..