Comment by oska

Apart from you question not being in good faith (because there have always been business models to support publishing and providing services that do not rely on adverstising and these models are well known), the main point is that they do not have to provide the answer to this question. Push advertising is unethical and culturally toxic and thus is not justifiable using the simple pragmatic argument of "It pays the bills". You can't justify unethical behaviour using a simple pragmatic argument. (Quite obviously; this shouldn't even need to be said.)