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It is not a deadname until you stop using it (The exception: When you're legally prevented from doing so).
I will stop "deadnaming" Twitter when the domain twitter.com no longer works or redirects.
There is nothing legally preventing Elon Musk from cutting off the name Twitter, so it is decidedly NOT a deadname. He keeps it for the ad revenue to come in, and thus, has chosen to not deadname it.
I will continue to call #Elmo's #SM the #DeadBirdSite. It is a zombie place. Let's see when it finally crashes. Long overdue.
@nibble4bits I will call it Twitter until there isn't any twitter branding on the site. Like the main URL...
As far as people go, I *get* that in some cases the jurisdiction they live in will not let them change their government name. But that move is against their will. I'll respect any trans or non-binary person's name to committing to a name they want to be called.