I don’t want ads getting federated to my instance.
There’s not any room for philosophical debate on that point for me.
There’s a lot of other reasons to not federate with Threads, but that one is the only one I need to cite to realistically appeal to literally any and all fediverse users with at least a couple neurons in their skulls. And it’s definitely the only argument I need to cite to an instance admin who’s running a lemmy container on their home server.