There's a contradiction in the "higher priced tier is ad-free" model which is that there are two kinds of people: (1) people who can't afford the ad-free tier who can't afford anything else and (2) people who could afford the ad-free tier who are worth advertising to.

It's been the reality of media business models for a long time, like those big thick magazines like Glamour charged a high subscription price to qualify subscribers as people who can buy what's advertised. It's also one of the many reasons why I have distaste for The New York Times -- it is packed with low quality ads that discredit the quality of their editorial content. They're so greedy that an expensive subscription isn't enough, but the expensive subscription, in itself, improves the viability of the advertising model.