SCUM is another one of those games that uses Easy Anti Cheat, which does not allow vorpX injection. See large list of EAC games here.
I was about to purchase and try this game over the summer, but didn’t. It seems like I read of a way to play offline singleplayer without EAC, but I don’t recall for sure.
If it weren’t for EAC, SCUM would probably work just fine with UE4 vorpX. I keep hoping one day we’ll be able to play EAC games. That list is growing quite large already.