I do not know how all these is done.
Plagiarism is sickening, but using it to monetise it is the worst, without duly giving the credits to the original content owner.
I hear you bro, follow these steps:
1. Go to the Youtube video
2. Find the ellipses button ( ... ) under the Red subscribe button.
3. Click on it, a drop-down box will appear.
4. The first item in the drop down box is .... Report button. (Identified via a flag)
Once you click it, you tube will ask you few question, fill in appropriately.
Hope this helps.