In San Francisco, it has to be. Because of prop 22, Uber/Lyft must compensate drivers a minimum of $22.40/hr, plus $0.36/mile for vehicle expenses. Waymo doesn't have this cost, so it's effectively ~$25/hr cheaper to operate than Uber/Lyft.
I looked up the numbers - the estimated Uber/Lyft cost per mile in SF is ~$4.50/mi, and Waymo is trending around $1.40/mi (estimated 2025 number).
> Waymo doesn't have this cost, so it's effectively ~$25/hr cheaper to operate than Uber/Lyft.
Waymo has other costs, such as engineering driverless operation.
Where is this estimate? I found a wide range of estimates in my web search, from a per-mile cost of revenue of $2 (meaning a loss of $2 per mile excluding capex), to up to $50/mile.