And on a self-driving car? The tolerance would be much lower because public trust isn't nearly as high.
You are correct but it's WAY higher than 1 in 1 million.
17.3% of model S's produced from 2012-2015 reported an error to the NHTSA . They finally recalled 2/2021

Tesla Recalls 135,000 Model X, Model S Vehicles for Faulty Display
Tesla is recalling the 2012–2018 Model S and the 2016–2018 Model X over infotainment screen problems after NHTSA pressured the automaker to do so.