That’s just a variation on Substack
Substack lets you make money by monthly subscription, your ad idea is different from this the way cable TV is different from YouTube I guess
Even more examples in this post from Revue, a new competitor to Substack, both platforms for creating paid newsletter publications: https://medium.com/@revue/how-to-build-your-own-paid-newsletter-and-the-people-who-are-doing-it-3c3073ad495a