Gosh, I mean who wouldn't?
You already know that you cannot rip off just any content off whatever you find on Google because those web pages / web sites/ online content are usually copyrighted. So yes, legally speaking you cannot rip them off for commercial gains or you can risk getting your online business shut down!
And who would want that to happen to them?
In fact, I am totally against plagiarism. In my opinion, it's a lot easier to make money the honest way.