This comes up again and again. People will continue creating and posting even without ad money. They will post for art, for study, hobbies, social issues or just to organize events. There are also those who publish free content and make a profit on something related. That's how the good old internet was working back in the day.
The problem with current internet is that everyone is trying to get the ad money so they don't really align their interests with us who want quality content.