ThreadGoogle formally unveils the "Stadia" launching in 2019
I feel that it would be helpful to clarify that a little bit. The picture displayed at the conference features edge network nodes Google builds/operates, including Google Data Centers/Google Cloud Platform regions, Google PoPs (Points of Presence), and Google Global Cache. For most people, when you access Google services, your traffic generally follows this path:
Your Device -> ISP -> PoP -> Data Center (with static contents served by Google Global Cache; for games it might be pre-rendered scenes, subtitles, audio files, etc.)
If helpful, think of PoPs as gateways to Google network; they are not data centers and do not run much workload, but they help provide a better network experience by granting you an optimized pathway to Google Data Centers. You do not need to live near a Google Data Center to get the best performance; being (physically) close to a PoP would suffice.
A list of Google-related PoPs are available here: , .