Re the comment by the_muteKi, about thirty years or so back, a tyre manufacturer stopped all their advertising in a car magazine. This happened because it had reported that apparently standard road tyres fitted to a new car for journalists to test-drive in wet conditions were special soft tyres and would only last about 300 !$%*!$ The con was that both the car and tyre manufacturer would get rave reviews for the road-holding from the other, less aware, reporters.
The car magazine simply repeated their accusations and the manufacturer's withdrawal of advertising and said they'd continue their policy of not giving in to blackmail. I had the same tyres on my car at the time and knew from bitter experience that the magazine was correct for, on a slightly damp road, the tyres displayed about as much grip as Bambi on ice.
Both the magazine and tyre company are still in business.