'Real world usage' as judged by people of totally unknown qualification, experience or skill.
All tyres are 'good enough' until the day you need to do an emergency stop or take emergency avoiding action and you go ploughing on another 10m into the back of another car whilst your ABS pump near enough explodes or end up facing backwards - that's when all the stories about invisible diesel spills etc. start appearing because it's definitely never the cheap crap tyres people were using.