The issue with Google launching these services is you don't know when they was/will be blocked in China. Not really a global competitor to CloudFront/Azure IMHO.
What compounds the problem with China is that the chinese are very much used to requesting an english language variant of the webstore as its often cheaper. This circumvents the CDN however as all stateful requests are routed to foreign servers making their experience really slow.
Also there's the chinese web license process that you have to go through to even host a website in china.
I cannot convince myself not to use a politically neutral company (or China friendly) like AWS, Azure.. when I am considering the CDN service.