Fortnite needs much much much much much much more space than specified dafuq?

I wanted to play Fortnite again but I had to reinstall it, I took a short look Fortnite requirememts there's 16 GB easy should fit then you download 30 GB and from the 30gb become 71gb I can do something about it, I only install Fortnite Battle Royale and not Save the world with just one language

16GB refers to the working memory that the program expects - not to the complete download package, where auxiliary tools are also loaded.

You could acquire some basic computer knowledge beforehand

RAM = RAM?

Yes.