Plagiarism is not allowed. You can copy and paste, but you must say where you got the material. You must add your own comments. There is a a robot called Cheetah who tries to catch people doing this. When people recognize you are doing this, they will not give you upvotes. Soon, you will start perishing. So you will demise yourself.
Thanks for pointing this out and informing people. A lot of people do not know, they are just trying to swim or sink. They are learning like everyone.
The best to you.