I would prefer lemmy.world defederate from Threads and any other major social media giant's attempt at federation. My reasons for doing so have been covered really well in other comments in this post.
I just want to remind everyone this is a direct quote from Zuckerberg regarding people handing over their data to Facebook: "They trust me. Dumb fucks."
RE: "What happens if the name of this community is changed? Lock this existing community and redirect users to the new one (this approach is similar to the Android community on Lemmy World)."
See: https://lemmy.world/post/1661949
I don't think you will be able to cybersquat on c/PCMasterRace, @[email protected]. If the community votes to change the name, c/PCMasterRace will be taken over by another set of mods.