It’s not that they just found out, but more that they have combed through and prepared all of the information they could legally release.

Genuine question: If the network is decentralized, how are they able to determine the amount of users on the system?

The article mentions opt-in usage reporting, but that would only indicate there’s around 115 million users actively reporting that they’re using it, right?

Agreed. And in a way, it is also a contributing factor to how polarizing internet-based discussion has become. Rather than show you the most cited websites for answering a political question, it’s going to use its profile of “you” to show you something you’re more likely to engage with.