Shimano recall | 2.8 million cranks affected globally
Global 'inspection and replacement' process confirmed for affected 11-speed Dura-Ace and Ultegra cranks
www.bikeradar.com
4519 as stated in the article out of >750k USA (2.8M worldwide), over 11 years.If they've sold half a million chainsets, that's 3000 failures. Not that miniscule in absolute terms.
Just one failure could lead to serious injury or worse. Not good in either a social or business sense