Its because we have reached a point where people are too stupid to know that Hollow Knight was not the first Adventure Explorer game, that Metroid did not copy HK but infact came before HK, and that Castlevania did indeed exist.
People these days be thinking Fortnite was the first Battle Royale style game. They don’t even remember it was originally a Tower Defense style game before hard pivoting to copy PUBG. Even PUBG wasnt the first BR style game.