I meant DnB as the one we don't see too often. I didn't really have metal in mind when I suggested rock, but you make a point that it often shares similarities with other genres, to the point where it becomes hard to distinguish where it stops being rock and starts being something else. Still, I'd say YaboiMatoi's and RichaadEB's covers are definitely metal (I did like them though). That Bad Apple remix on the other hand was more what I had in mind, and I hadn't found a Bad Apple cover with a good male vocal before, so I'm glad you shared it!
On the topic of what makes the difference between rock and metal, I'd say the main distinction is in the percussion.
I don't listen to that much of it myself, but I happen to know this one, so it might be worth looking into the circle that made this?
Faith is for the Transient People isn't that annoying to type out. The song I shared earlier was a remix of The Primal Scene of Japan the Girl Saw. Doesn't help it's been retranslated several times already.