Wait, the Waymo Lyft drives - the ones that are supposedly public - are under NDA?! Well I guess that explains why I've never heard of it happening.
Waymo is still Waymo whether they're running rides on their own behalf, or under the Lyft name. Someone who's ridden Waymo in an early adopter program may make their decision on whether to ride Waymo under Lyft based on that experience.
Get it?