A French government report in 2016 investigated 86 different cars, and about 1/5th of those were found to comply with emission laws. Most did not.
He talks about how it is possible that the cars achieve the low results in the testcycles but produce much higher emissions on the real road. The reverse engineering in the beginning of the task is also very interesting.
https://media.ccc.de/v/33c3-8131-dieselgate_a_year_later#vid...
I simply don't believe anymore there are any clean athletes in first 3 places in any sport where there are significant money involved.
And most people are happy to support this indirectly via their support of things like Olympics which became lately just hunt for sponsors. (I don't watch those anymore, rather will spend the time actually training, with friends, in the nature etc.)
Same for cars.
The funniest thing was the Ford would sell you a software update to defeat skip shift under the guise of a "performance tune", at least that's how I defeated it while still keeping my warranty.