I think you are overstating the problems of relying on IP transit somewhat. A typical content creator is unlikely to have enough demand for their videos to con

I think you are overstating the problems of relying on IP transit somewhat. A typical content creator is unlikely to have enough demand for their videos to congest IP transit links. IP transit is also very,very cheap. At scale IP transit is only about 5 cents per Mbps. Source: built and operated a global CDN in-house