There are under the hood data that is not displayed on the site which they can scrap. FB would be broke if they only rely on the FB posts alone without all the tracking everywhere. Even your movement on the screen or where you pause on the page are tracked.
So no they dont get all the data unless we federate them.
Its your choice as instance owner to do that
Visit https://fedipact.online/ to see a list of instance owners who will defederate their instance from Threads
Heads up: its a long list
Great heads up
I just don’t get why people would join SOCIAL media if they don’t want to their posts public. Its like having a group meeting in the middle of a public square and complain people saw them
Maybe they should just use discord or or private communities instead
While I agreed those who do not want federation with Threads should leave (me included), lemmy.world has not bent any knee. The admin is taking a wait and see approach, and willing to block if it turns out bad