That idea is true for the rest of those services too. We could just stop using all the services if they are all run by the same Corp and subjected to the same BS rules. If your Google drive got banned for explicit material, it's only a matter of time your Gmail would trigger it because you sent drafts between you and your publisher instead of using Drive.

If it's a true backup, it should be encrypted in my opinion, especially on the cloud. Then it doesn't matter since they can't see it.