The ruler only isn't "everyone".
Who then probably C/Ps it to the realm, if not immediately then as soon as someone asks what's going on, so that the realm knows. So sending it to the ruler is essentially sending it to the realm.
Not doing so lends itself to rumours and, in some cases, exactly the kind of anti-Titan sentiment that we really want to avoid.
With people that are predisposed to accusations of Titan-favoritism, is it really going to sway their opinions if they know that the account was locked because of something in some other realm? Or is it just as likely that they will accuse the Titans of being abusive about some other case?