The point of this post is to talk about key autonomy on Bluesky but I find it interesting for the poster's statistic on the number of people who are running their own PDSes: 997.
997 on the entire plc.directory network.
That's a large number by many standards, but not compared to Bluesky's userbase.
I do wonder about the methodology, and whether I would get excluded because my PDS technically has 3 users (me, and 2 test accounts belonging to me).