Because Steven Spielberg doesn't think so.
Last year Spielberg was quoted saying he doesn't think Netflix films should qualify because they dont honour the 90 day theatrical window.
“I don’t believe films that are just given token qualifications in a couple of theaters for less than a week should qualify for the Academy Award nomination.”
But the current rules do allow for limited theatrical runs to be eligible for awards. This is probably what Spielberg wants to change.
A quote from Spielberg's reps.
“Steven feels strongly about the difference between the streaming and theatrical situation. He’ll be happy if the others will join [his campaign] when that comes up [at the Academy Board of Governors meeting]. He will see what happens.”
http://collider.com/steven-spielberg-netflix-oscars-rule-change/
As streaming continues to grow each year theater chains are becoming increasingly concerned that they will eventually be phased out in favour of day and date streaming releases. I kinda see where Spielberg is coming he wants to preserve the theater experience but to me this just comes across as old man yells at cloud. What do you think? Should Netflix play by the rules if it wants to get nominated for awards?