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First of all I want to say thanks to you that you comment on my post and I always like most valid de comments as you have also highlight one of the major point from my post.

You have talked about quadratic reward curd system and its implementation so yes it was the most starting reward system since steemit is created and there are many disadvantages of this system that's why there was a need to modify them so linear reward curve was the second one option that was chosen as a reward system after the quadratic reward curve....

Good luck to you in your entry