I can almost guarantee, given the way no traffic laws are enforced anymore in LA and so many cars are breaking them that cutting off a waymo car in dangerous ways, because you know it has the attention and reflexes to yeild, will be a new thing.
If it becomes a new thing, it would be fairly trivial for Waymo to respond by sending footage of incidents involving reckless driving to local authorities.
To prevent over-reporting, they could even make a system which logs number plates and only reports it if (for example) the same car is involved in incidents 3+ times in a week.