Can anyone help me understand what any Mastodon instance can possibly stand to gain by federating with Threads? The size disparity is absolutely massive. Anything going to Threads will be lost like a drop in the ocean and anything coming from Threads will be a deluge that drowns anything on Mastodon. You can limit your instance to only one of these but it's still bad.
Following Threads posters from a Mastodon client sounds ok at first, your users can get lots of Threads content, they get accustomed to it, and one day Meta changes the protocol and now you have to decide if you're a Mastodon or a Threads client. Or your users start wondering why they're using a subpar Threads client when most of their content is on there.