This is glaringly evident at the very least in the way Apple and Google (don't) apply app store review to their own apps, so I don't understand why you're being downvoted.

FWIW I think Apple's apps do actually go through review, but the issues that crop up (non-public API usage, etc.) get swept under the rug (don't quote me on that though). Similar to how third parties blessed for private API usage probably get their apps through review.