It's very simple as people behind rating agencies are marvel fans hence they hate DC comics thus they need to downplay DC movie's impact specially when there's competition with Marvel movies..
It might sounds conspiracy theory to someone who doesn't have any clue about either comics but it's the truth.
See end of the days, comics fans are nutty when it comes to their fandom. They used to be made fun of by jocks and athletes in highschool and so on. Most of them probably stay virgin until college (some of them even after college in extreme cases).
Hence, you will find them that they hate each other's comics and comics book counterparts.
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