I generally find that Waymos are cheaper than Uber/Lyft including tip.
I’ve also seen that, although Uber and Lyft peak times seem correlated to each other, they seem uncorrelated to Waymo peak activity. But this might be stabilizing as Waymo ridership increases.
The real question is why tip on either of those? You pay through the app, the driver is compensated for their time, why tip extra? If you feel that Uber/Lyft are mistreating their drivers, stop using their service, not pay them on the side?
I’ve also seen that, although Uber and Lyft peak times seem correlated to each other, they seem uncorrelated to Waymo peak activity. But this might be stabilizing as Waymo ridership increases.