OK.
How to do suggest they defederate from an entity which isn't federating with anyone?
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy
OK.
How to do suggest they defederate from an entity which isn't federating with anyone?
To be fair, they can "prempt" Threads.net by blocking the domains. That's basically how they block other instances.
I personally think the default should be to block Threads.net and federate if and when a server wants to, rather than waiting for Meta to pull a switch. However I disagree with OP's approach of blackmail and threats, and his idea he "owns" the communities he moderates.
Good luck! And don't wait for so long, delete right now.
As much as I hate meta and hate the idea of threads federating with us, ultimately you should be able to find or create an instance that aligns with your idea of defeding with them. I would ultimately want the admin of my instance to side with the majority of users rather than drag users kicking and screaming into following their lead.
Besides, if you truly wanted more control over your web experience, we should be more decentralized. Like what the hell are we all doing on the same instance, and being shocked that the decisions of a small group of people is going to affect so many of us. Like we were all encouraged to join smaller instances or make our own precisely for this reason. Like hypothetically, if every popular community was in its own instance, rather than centralized around world, ml, beehaw and kbin, Meta federating with us would not be a big deal. Every community would be able to decide whether they wanted to associate with them or not, and we would be too spread out for it to be worth Meta's while.
Maybe this should be a wake up call for some of ya'll. Spread out and take your own actions, rather than wait for the big instances' admins to act for you.
Two thoughts:
lemmy.ml
has definitely defederated already.