I have no idea.
The other side is , sonic can make money at $70 with normal rollout costs, why is Google gouging the KC-ites for $70 and hosing them on the normal "cost of business" RoW/power/inspection/franchise/etc. expenses?
Based on every FTTH proposal I've ever seen a $70, zero install is a non starter UNLESS someone give you the money for 30 years for free or you can get and keep a very high take rate with 10years plus VERY low interest rates.
If Dane Jasper wants to open his books/share his secrets, I'm sure lots would be interested (it would be nice for Google to share some info too, but I'm not holding my breath for either one.)