Niche sites abound on the internet. Financial Independence and Childfree sites have already become saturated in their respective spaces, but I hardly see people combine the two. The reasoning makes sense, though - Why split a small audience into even smaller chunks?
Well, we'll see how "small" this subset really is. Plenty of my friends are both into financial literacy and not having children, and the two compliment each other quite well; each choice saves money and increases your free time, after all!
I hope you'll enjoy exploring how much choosing not to have children affects your financial future and the amount of leeway it gives the rest of your decisions.