During a transgender person's "transition" their name is also likely to "transition" hence, until a court order legally changes their name, they may use a preferred name in non-legal contexts. Forcing someone to use a legal name in a non-legal context (e.g., Facebook) is one problem. Allowing a user enter their desired name and then using surreptitiously gleaned information to change that name to their legal name is a different problem, but a problem none the less.