𝓻𝓻𝓪 on Nostr: Laurens, which ones in your view then are the best to track to understand the ...

Laurens, which ones in your view then are the best to track to understand the diversity of the ecosystem? What is the analog in atproto to tracking numbers of instances and numbers of implementations (such as Mastodon) in AP? Are PDS more like instances and Appviews like implementations?