@pierce Great article but there was a lot of confusion about decentralized vs interoperable.

Email messages are interoperable and decentralized but contacts are over-the-top services that are neither decentralized or interoperable without special export/import features

There's nothing about ActivityPub that says my toots will be able to show up in tumbler. The data models may be incompatible. ActivityPub is the protocol for how data should be shared, not the structure/content of the data.