> Other possible explanation: people aren’t using Crunchbase as religiously as they used to. We didn’t put our round on Crunchbase. Everyone we care about uses AngelList.

I find this much more likely. A couple years ago Crunchbase seemed to be way more up-to-date than it is now. Reasons probably include: AngelList gaining traction, TechCrunch no longer seems to be as actively updating Crunchbase and isn't including a big "Crunchbase box" at the bottom of each article like they used to.