Meta recently launched Threads in a seemingly rushed state likely aiming to capitalize on Twitter’s recent actions, missing features such as Digital Markets Act compliance and ActivityPub support.
Some communities have decided to preemptively defederate them as soon as that gets implemented under fears of them repeating what google did with XMPP by using “Embrace, Expand until no one else can keep up” tactics, while others have claimed those fears are overblown.
I definitely think they pose a threat to the overall health of the Fediverse. Nothing good has ever come from Mark Zuckerberg, and Threads wouldn’t be using ActivityPub if he didn’t think he could wrangle control of the standard itself from us like the aforementioned ruining of XMPP.