For what is is worth, I've been using their Free Tier to serve over 10k requests per hour with ~60% html / ~40% media (mainly pictures, very few videos) and I'v

For what is is worth, I've been using their Free Tier to serve over 10k requests per hour with ~60% html / ~40% media (mainly pictures, very few videos) and I've never had a problem. However, for a CDN for video content YMMV. Perhaps you should try contacting them directly to have a written estimate.