They write ads like these looking for free work.
"Beautiful Models Needed
Lovely beautiful models needed to pose for pictures. I'm really classy. There is no pay but you can build your portfolio."
"Looking for a cartoonist
I need a cartoonist to help promote my pizza food truck. I cannot pay you, but you will get all the pizza you can eat and a lot of exposure."
Thanks. Pizza can really pay my phone bill.