Well, they're pretty big, right? Matt Yglesias has some 15k subscribers on Substack paying $8 / month and increasing. Even if Substack takes 50%, he makes some $720k / year off that. And his growth is quite rapid. It is quite feasible that he makes a few millions a year off this for the rest of his active life if he's up for this.
That’s not Hollywood money.
MrBeast, a guy who can afford to buy private islands by making Youtube videos, isn't a superstar?