In order to sue for copyright something must first be something that can be copyrighted!

Here's the things about the lawsuits: while they all allege copyright infringement, no copyright infringement has actually occurred. This is an extremely difficult hurdle to leap when suing over copyright infringement.
https://www.techdirt.com/articles/20181227/14361041301/creators-dance-moves-suing-creators-fortnite-over-copyright-infringement-that-cant-possibly-have-happened.shtml