100 points for things nobody asked for

It is still on Meta servers.

At the moment you can't even use the web UI without installing the official app so I am skeptical.

If it really starts supporting ActivityPub, you could start seeing Threads posts in a fediverse feed that also includes posts from Mastodon, Reddit alternative Lemmy, and any other platform that runs on the protocol.

Please no. The last thing Lemmy needs is a tsunami of Facebook normies. Instant Eternal September.

I think this is nice in a time when social media companies have been actively killing third-party apps

Be the same as Twitter/X and Reddit. Use the Microsoft Embrace-Extend-Extinguish approach. Get some nice third party clients using the API, realise you can't pump ads into them, block them and force people to use the official apps because everyone is now using the platform and can't go anywhere else.

Is there someone using Threads?

take control of activitypub and forcibly remove Facebook from it