I've found that, whenever considering Google's actions and incentives, you need to remember two things:

- They make almost all their money on advertising

- They have deep ties to the US intelligence agencies (To the point that a Google employee managed the appointment calendar for our Secretary of State a few years ago!)

So, how would these incentives apply to their Internet blacklist?

- If you are parking lots of Google ad spam, they are taking a cut of your revenue, so they have an incentive to take you off the list (evidence and testimony from the antitrust trial documented ongoing fraud in every layer of Google's vertical ad monopoly)

- If you are hosting something the intelligence agencies dislike / are neutral to / like, that'll impact your presence on the list.