It probably won’t do much, but then at least they know we do not approve of our countries performing in a contest together with an apartheid state. And who knows, maybe they do listen. In my mail to AVROTROS I highlighted that it’s hypocritical to not boycot Israel after Russia, that Israel is committing genocide and that a lot of people will boycot Eurovision and AVROTROS if they don’t boycot Israel.
You don’t have to be a Eurovision fan yourself to message your broadcaster.
Eurovision is in May, but the list of all the participating countries got released and Israel is one of them.