Again we are talking about 3 of the 30 vehicles they have on road failing at the same time. Imagine if 10% of taxis in your city suddenly froze in place for 20 minutes until a special tow truck came after a pedestrian called the number on the back?
Or if all taxis in your city, when traveling through a particular intersection froze in place, requiring bystanders to call a response team from the taxi dispatch to come out and show the driver what to do?
It would be interesting to see the metrics of number of interventions/calls/responses Cruise is experiencing daily/weekly/montlhy.
In practice, if companies have these kinds of issues regularly, it'll be similar to how scooters and dock free bikes have been rolled out: they'll be allowed initially, then the city officials will kick them out if they're causing more trouble than they're worth.
A better metric would be incidents per hour driven, not per vehicle.