Agreed! The diagram [1] is super handy, and lets me reiterate why we waited to so long to do this: 10 Gbps of peering is just not that rare (and you probably want it for updates, etc. anyway). Even as you get to the petabyte range, being able to just hit "Go" and then do differential updates is so valuable that you really have to be talking about lots of Petabytes in a location where (or reason why) you can't get 10Gbps plus of peering.
Disclosure: I work on Google Cloud (but didn't work on this)
To add to Boulos point - Google Cloud has the "Cloud Transfer Service" [0] that's hugely popular. It's easy to get connectivity to Google's vast network of POPS and this service helps take advantage of that connectivity. Also S3.
