Yeah the mutuality argument is a strong one IMO.
It would be great if the fediverse did have the leverage to influence meta to accept other content.
At the same time, I wonder if there could ever be an implementation that detects asymmetrical & unfair practices across instances to give them consequences in real time.
I also wonder how the rest of the fediverse can do better to demonstrate its value, in terms of users and content, which would cause threads users to desire content from us.