Also, donโt leave your account unused, delete it. User and follower numbers count.
And least as important, reply (if necessary to another corporate mail address) every email with Twitter/X in the footer, with a kind request to stop promoting and facilitating X.
This is definitely an aspect of social media in general. An argument can be made to register your profile and let it lie dormant just to avoid it being hijacked. Hijacking has been an issue in BlueSky during the Twitter migration bursts. Sure - the companies can use the registration for statistics, and the decision to register is somewhere between performance and personal integrity.