The other problem here is that I don't think a lot of people actually know how defederation works. There's lots of takes like "I don't want Meta to get my data, so we have to defederate." But defederating stops you from receiving their content, not the other way around. Once Threads actually is federating, defederating it will stop people seeing posts from Threads users. That has its own merits, but it doesn't protect your data in any way. If you don't want corporate entities to access your online posts, either send them via some private end-to-end encrypted system where only you and the direct recipients can see them, or don't post them online at all. The Internet is on the Internet.
Now, a bit more of an explanation on what defederation is: while the decentralized nature complicates things (since different servers will have different defederation lists), defederation is closer to a Reddit shadow-ban than whatever it is people are imagining. If literally everybody defederated Meta/Threads, they would still see our content, but from their (Threads users') perspective, it would just seem like we're all giving them the silent treatment, because we never respond to their posts or comments.
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stevecrox