The SBS knows that it's connection to Eurovision is tentative. We're sorta a novelty, like a guest who is cool so everyone is happy we extend our visit. We are in because SBS is a member of the European Broadcasting Union - which is a bit of a technicality. But everyone likes us so they let it slide. If we start rocking the boat or making a fuss, the rules of membership will likely become more strict to exclude us. It would likely also exclude other non European nations like Israel.
Something that I see as already a bit of a risk. If they make the rules more strict to exclude Israel, that ruling would also likely exclude Australia.