Nobody claimed it WAS original. It's very hard to make a game that is truly original anymore without having the major risk of failing.
That's why game developers choose to take aspects from games that they know people love and build a new experience around it.
Its common sense.. It will still be a great game regardless.
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Thank you, it kind of has to be unoriginal, it's like pokemon, there are only so many things in the world, it's unoriginal and original at the same time. You take all these great ideas, smoosh 'em together and you get something new