They can't assure that. It's up to the user to do that, YouTube's upload system is automated for the most part.
@TeamYouTube Can you make sure that my video/upload get uploaded quickly and in 1080p HD. Heres the URL https://youtu.be/WdXc3gGJ3lU
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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