Posting on an American Site

In the past two days, it has come to my attention that someone has posted various audition entries on a predominately American Talent site. I started receiving applicants for auditions from young people from across the United States. Upon further inspection, I was able identify two posts for my next show along with a number of other shows across Australia.

It would appear that someone has been taking audition notices from Theatre Australia and posting them there.

Has anyone else had this problem? Does anyone know who is doing it? and Why?