Gumtree Australia, please stop selling pets!!!

I read in several petition groups etc. that Gumtree Australia´s selling animals, that´s not right, animals are no goods and should be adopted, not bought, anyway!!! Or if someone should sell pets at all, then a serious breeder who doesn´t let his/her cats and dogs have babies more often than twice the year.
Contact-E-Mail: https://help.gumtree.com.au/