A business cannot own a genre. That's like a toaster company suing another company for also making toasters. Fortnite hasn't used anything that is owned by PUBG. PUBG Corp. appears to be using their newly enormous revenue stash to either lose a lawsuit or intimidate another company. Both are stupid, but one is also dirty and will hurt the PUBG brand as is already happening with its user reviews.

Also just because you win a suit doesn't mean you're awarded everything you ask for, and asking for too much can hurt you more than help. Not even sure if PUBG is asking for money or just asking that Epic Games be forced to stop using "their" IP.