Ikea email. You get the parts and assemble it yourself

Yup, I think so. That’s why I gave OpenID and XMPP as examples.

Tumblr wouldn’t be much of a deal but if Zuck gets Activitypub integration working that would be a huge pain in the ass

I think you’re right about the Threads situation. As always zuck is pumping out buzzwords and hype.

Tumblr announced they will be starting to work on activitypub integration in November 2022 but I guess either it’s taking a long time due to how Tumblr works or they completely forgot about it

I hope not. But even so seperate networks defederated from Threads can exist which is the most optimistic outcome if Threads implements activitypub