This lawsuit does include some things that Epic took from PUBG (like a fixed island map that you airdrop into), but its claims that those particular things are copyrightable creative expressions are questionable. Hell, they include "a grid map with a two-letter coordinate system", "health packs taking a while to apply", "needing to scavenge equipment", "realistic weapons", and "damage based on hit location" in the lawsuit. It also makes some claims that just obviously aren't true ("unlike other shooter games, Battlegrounds does not display designators above opposing game characters"). But it also includes some aspects which are more obviously unique to PUBG, like the frying pan being usable as invulnerable butt armor.
Free Fire looks much, much closer to PUBG than Fortnite BR. The screenshots in the complaint are pretty convincing. As someone who hasn't played PUBG for a few years, you could easily trick me into thinking this was a new version with updated textures. It even has a frying pan that can be used as a weapon or as invulnerable butt armor, and a "chicken dinner" victory screen!
Then PUBG became popular. Suddenly Fortnite, the game I bought, was an entire different game... and released for free. Yeah, it might not be illegal, but it sure was a shady, asshole move by a monopolizing megacorp abusing their market position and exploiting their engine customers.
Heck, even your example of Warfcraft wouldn't have happened because by the pro-IP crowd's standards, it would have been a "rip-off" of Dune II.
I remember when the tech community fought overly broad IP claims and patents, now its just pro-IP shills left and right. Its incredible how far we've fallen.
Dune 2 -> WarCraft -> WarCraft 3 -> DOTA -> League of Legends.
Come to think of it, the only time Blizzard invented the whole genre was with Diablo. All their other (incredibly successful) games were refinements of prior work by other game developers.