SAAS isn't a one-off purchase, it's a rental with ongoing rental fees.
The intention of the wording of the petition is that it only covers "purchased" items. If a customer is given the impression that they are buying something then it should act like any other bought item. If they are given the impression they are renting something then it's out of scope, that's expected to abruptly die one day.
effectively withdrawing customers’ rights under the Australian Consumer Law to ownership and undisturbed possession of their purchased goods
^ it's a bit subtle if you're not familiar with the campaigns' language.
This means other people will misinterpret it too :(