https://fedipact.online/ is a list of instances that have pledged to preemptively block Threads. Includes my own instance (lemmy.name) among many others.
I run my own instance and am defederating immediately (whenever they start federating). I did also join the pact.
I'll evaluate their impact a month or so in and decide whether or not to refederate.
I acknowledge there's potential for a positive impact here, so I will give them a chance.
Congrats, ya'll! 🥳