Process instance assign first potencial actor to field "created by" when it is empty in process definition

Right now when a process instance is created it fills the "created by" field if it is empty. It uses the first potencial actor available. Is there any further reason behind this?

Can that field by filled with admin user or can RHPAM use a new generic user (engine or similar) to fill this field "created by"?

That seems more accurate for some users