@dynode @collectifission @kolchak if they enabled Federation for all accounts it would crush the rest of the fediverse in traffic very quickly, especially for federated Deletes which get delivered to every server you know about because you can't be sure who has a copy of the post

And then you'd have bots auto following Threads accounts and boosting them onto various servers and very quickly Threads would consume all our capacity unless so you'd have to block them.

Just think about it with celebrities -- they'll have 100k replies to some stupid selfie they posted and then your server tries to fetch the entire thread? That's not gonna go well, you'll have to pull the profiles of each user just to render the thread AND their dumb emoji reply activities

*Or* they can just let users opt-in to federation so the growth of their federation traffic is more controlled

ActivityPub was not well designed for scale or accepting a server with a billion users to just suddenly enter the network.