I think you are confusing the long term and short term outlook.
In the short term Waymo will have a very strong bargaining position because their technology is so advanced - Lyft cannot buy self driving tech from anyone else.
But in 10 years Lyft will be able to choose from a half dozen companies offering self driving tech. 'Ride sharing' will be a cut-throat commodity business like airlines, but Lyft won't be at a particular disadvantage compared to other companies in the industry.
In the short term Waymo will have a very strong bargaining position because their technology is so advanced - Lyft cannot buy self driving tech from anyone else.
But in 10 years Lyft will be able to choose from a half dozen companies offering self driving tech. 'Ride sharing' will be a cut-throat commodity business like airlines, but Lyft won't be at a particular disadvantage compared to other companies in the industry.