The fediverse is entirely public. Every action you take (all posts, votes, favorites, etc) is public. Meta will scrape all the data whether Threads federates or not, there's no privacy difference because there's no privacy!

[–] CoderKat@lemm.ee 3 points 1 year ago

Why would they need to scrape anything (which puts them at legal risks)? Threads is vastly bigger than the Fediverse. What do they care about having 1% more content, especially if a lot of that content is stuff their users don't care about? They don't even need to scrape stuff because humans will naturally repost content. How much of reddit was reposted from other social media sites by humans?