@irelephant @jwildeboer In a recent interview with Rudy of blacksky, he described the PDS as the most complicated part (and they should know, they have re-implemented or forked basically all the parts now). Yeah this surprised me too.

The anecdotal information I've found on the appview itself suggests that it follows a similar distribution to the PDS, but with far fewer of them so far. I'm looking for a data source, though.

Above the appview layer, I do think feeds and labelers are likely to show interesting decentralization; labelers are probably possible to get actual usage data on, but AFAICT only bluesky can provide data about the use of feeds, and they don't (all that's available is the number of likes, which is not the same thing.)