Well, that's a no-go. We're a small startup that's scraping by and only recently we're starting to get some traction on our GMail integration. If we're asked to undergo such a review, we don't have the $15k+ to spare, so we'll likely say goodbye to the ecosystem. Like someone else said in this story, we're probably just going to focus on Microsoft which is much more developer friendly.
Worst of all, this won't stop intentional bad actors from stealing user data for whatever purposes they have in mind. Big pockets are going to laugh even at a $75k fee.