I think I'd like to see SwiftLint as another option for enforcing some sort of a unified style guide. I'm not sure what specific benefits Google's tool brings to the table, plus I'm not sure it would be advisable to commit Swift users to use some 3rd party tool in that sense.
In the general consensus, Style Guides are great. As @mergesort mentioned, the Go community gained quite a lot from
gofmt. With that, there are also different preferences for some developers and teams, so there should be great tooling to allow for this flexibility.
On the back of my head, I'm worried enforcing a style guide is a bit too robotic for all Swift developers. And I'm worried about cases where the formatting suggested by Google/Apple will be dissatisfactory. Like happens many times when using "Auto Format / Auto Indent" inside Xcode and getting sub-optimal results.
So, overall +1, with some worries :)