Unfortunately, this is a Tragedy of the Commons issue, where the ever-expanding list of webfont hosts results in a detrimental experience for users, where other

Unfortunately, this is a Tragedy of the Commons issue, where the ever-expanding list of webfont hosts results in a detrimental experience for users, where otherwise a single popular host would result in a much higher likelihood of cache hits. Not saying you shouldn't use the best solution for you. In fact, I ship code that hits the Hoefler & Co. webfont CDN because it's the only source for the fonts we use.