the specificity of between web apps that is highlighted by the article is that you receive a bundled code of software every time you open or use the app, as opposed to say, the operating system or desktop apps, which are less frequently updated. (Native) mobile apps are like web apps in that they release updates almost every day.
I suppose they mean that apps should brand their non e2ee chat features as private or personal, which is what users take as the default assumption when interacting in one to one chat.
so we agree that governments only using the safety of children as pretext to extend their control of people's lives, otherwise there are better solution protect children of the harms of the internet.