This would be an incredible public service. While I believe Google is within its right to censor information on their platforms, the opacity with-which they do it is imo unacceptable, given the scale of their influence on the public dialogue. Similarly, I think any media conglomerate should be required to publish any formal lists of in-house gag-orders.
Ironically, it was google that first innovated along these lines with their “chilling effects” project. Any time a URL was removed via a copyright complaint, they would log it. If a search result was censored, you could see the copyright complaint. I’m not sure if they still do this.