We've had to go through this process for the app I have, and it definitely was cumbersome and makes the process a huge pain. Fortunately, after a while Google often lets you switch to a Tier 1 assessment, which involves using various tools to analyze your code and make improvements without shelling out a ton of money.
At the same time, Google is in a tough spot here. The files and documents in your Google Drive (or Gmail) are incredibly sensitive. One possible solution is using the https://www.googleapis.com/auth/drive.file OAuth scope, which only lets you access files a user has explicitly shared with the app. I'm curious if iA Writer has limitations that makes this a bad user experience, but from a user security point of view, I can see why I want the apps that get to see my whole Google Drive audited too.
At the same time, Google is in a tough spot here. The files and documents in your Google Drive (or Gmail) are incredibly sensitive. One possible solution is using the https://www.googleapis.com/auth/drive.file OAuth scope, which only lets you access files a user has explicitly shared with the app. I'm curious if iA Writer has limitations that makes this a bad user experience, but from a user security point of view, I can see why I want the apps that get to see my whole Google Drive audited too.
[1] https://developers.google.com/drive/api/guides/api-specific-...