
How is that different from defederating now?
In the Embrace, Extend, Extinguish scenario, assuming they get to “Extinguish”, the rest of the Fediverse becomes isolated and cannot connect with their friends and content.
If we defederate now, the Fediverse becomes isolated and cannot connect with Threads content, and cannot connect with friends who choose to be on Threads instead of a disconnected alternative.

Good-faith question for you admins to laymen like myself; what do you believe you are protecting yourselves from by blocking Threads? Isn’t the nature of the Fediverse resistant, if not immune, to corotate shenanigans? Isn’t the only thing you’re accomplishing by defederating Theads is that you’re just making yourselves invisible to a large userbase who are too lazy to care about their own personal data?
We’re all still protected, no?
“Prevention” perhaps in the way of amputating a broken arm. If we apply the exact same scenario of the e-mail/Gmail to the Fediverse / Threads, we’re talking about a loss of (or lack of) some functions, but the foundational connection will still remain. Meta can dangle carrots with their bells and whistles, but the people who want to be on a non-corporate instance will remain here. We can still receive content & comments, and we can proselytize the benefits of a non-corporate Fediverse while still offering the same content & comments.