In a cloud based Nintex Start form make the user context of an authenticated user available in the form designer.
Currently the user context is only available in the workflow not in the form. With the user context available in the form designer we can use the user context in form rules or primarily as a filter in the new data lookup control.
Since there is no user access management on a per form/workflow level, this is the closest (albeit ugly) workaround that could be used (lookup the current user to see if the rest of the form should be shown).