Go looking into almost every successful game since whenever and there are always roots, always some way to say "that's just a copy of X" and demand justice. Everything begins somewhere else. Every painting has history in other paintings, every poem in other poems and every movie in other movies. Even across genres and whole classes of creative endeavor, everything has its origins.
And yet the market doesn't seem to mind, or even notice. It doesn't remember everything that was ever released and maintain a vast internal catalog. It remembers generally only within a platform, within a couple of years (maybe 3 or 4). It isn't paying as much attention as you think it is. For some this is hard to accept, particulary the long term fans motivated by certain types of marketing story, but it basically explains everything.
The reason why movies of certain types get made over and over is that although you might remember previous efforts, younger versions of you do not. The reason why some franchises persist through the decades is similar. You might think they should be sick to death of playing a FIFA, say, but it just recycles. New players come into it, older players experience enough passage of time that they feel like picking it up again. Professional marketers call it "churn".
Yet this does not mean we're all just a little bit of history repeating. Enough true fans exist who do have long memories and care enough to share them. Enough individuals exist to establish the tone of context, to judge one game worthy over another, that the marketing story persists. While it may have amnesia for a while the same themes and cares emerge. Things repeat and founderworks decline, but masterworks evolve in their place.