It uses activitypub, the same as Pixelfed. It is the same creator afterall. AFAIK, it is not yet federated. It ask for registration because it is pretty much in open beta right now. No other fediverse alternatives for Tiktok except that.
Edit: more about them on the FAQ.
Let it go bro. Just switch to Firefox & co. Or at least use it less for something that does not require ad-blocking.