Jeg svarer lige mig selv, fordi jeg tydeligvis mangler at læse siden inden jeg skriver herinde:

ActivityPub is a W3C standard that enables interoperability between platforms like Mastodon, Flipboard, Ghost, Threads and others. AT and ActivityPub should not be either/or options.Our vision is that interoperability between open social media platforms is achieved through collaboration. This campaign can organize developer communities, fund product development, support testing that improves bridging and native protocol interoperability.