This is a legitimate movement in my eyes. I don’t participate, but I see it as valid. This is reminiscent of the Luddite movement - a badly misunderstood movement of folks who were trying to secure labor rights guarantees in the face of automation and new tools threatening to kill large swaths of the workforce.
It's easy to see the word Waymo and think clanker autonomous car, but there are very often people inside that car - they are a rideshare service after all. Calling endangering other humans "legitimate" because you dislike the taxi company is not a good look.
People are free to reject technology as they please.
If you deliberately impede the flow of traffic, vehicularly assault, or otherwise sabotage the health and safety of drivers, passengers, and/or pedestrians, what do you deserve?
If you cause whiplash intentionally, what do you deserve?
What would be use of equal force in self defense in response to the described attack method?
What exactly do you mean by "legitimate" and "valid"?
Are movements valid if they have aims that you agree with, or are economic self-interest motivated, and invalid otherwise?
Please tell me that he does realize that when something bad happens, that Waymo car has all the footage that it is his fault?
Something in people's brains often makes them think they are anonymous when they are driving their car. Then that gets disastrously proven otherwise when they need to show up in front of a judge.
The Luddites were employed by textile manufacturers and destroyed machines to get better bargaining power in labor negotiations. They weren't indiscriminately targeting automation, they targeted machines that directly affected their work.