I think some of you are missing the point.
You are too busy going "OH LOOK I'M COOL I THOUGH OF REINCARNATION BEFORE" too enjoy the actual meaning of this.
Of course, the idea of reincarnation is old, and when I first started reading it, I though it would be just like any other one of them.
But then, the ending, the thing about the egg, the god, his son. I will call bullshit on you if you say that you already had a theory about that before. And if you didn't notice by the title, that's what the twist of the story is really at, not the reincarnation crap.
Also, yes, some retard posted it on 4chan without source, trying to be cool, then someone saw it and posted it on reddit.
But of course, reddit is like the civilized 4chan, so they found the actual source and gave him credit for what he did.
But it's fine if you found this lame, as you can see it's quite evenly split. People just don't get impressed by the same types of stuff.