I don’t even know what paper gold is, lol.
It’s like a non fungible token (NFT). Think of an artist who paints a one of a kind painting. Someone takes a digital picture of it and sells it as if its the original but anyone can copy and paste that digital representation even if it has a watermark and claim it is the original. So there you have a derivative version of the former one of a kind painting in innumerable quantities. Paper gold is pretty much the same thing.