Sega is 100% in control of which traffic it's currently allowing to reach their services. It's neither Comcast nor level 3 the backbone. This was confirmed last maintenance when twc users were allowed to access the site and servers. If you don't know already both Comcast and twc both use the same exact backbone provider. We will all find out after this maintenance whether they will rotate in another isp and rotate out twc or whether they will block or unblock everyone.