The money is in the list!
If someone is serious about their site, not a hobbyist, they night want to consider pumping money into a list. That would involve making an email list and/or build some kind of social media following. However, it probably won't be cheap to do. Also, even with cash, it might not be easy work.
Webscrapers work pretty well to get your own list, but it only works for certain niches. Like if you are trying to pull contact information about a particular business or something.
That would spam people. That's a good way to get killed, lol! The right way is to get them to voluntarily join some list.