MapDec in Kendal had this policy, made a short video where they mentioned such, then seemingly got added to a “banned list” held by Madison when they refused to take said video down. This then lead to another, fairly humorous video/webcast being posted where they doubled down on their position and effectively gave Madison the finger.
I sympathise with them to be honest; their take is ‘if we examine a crank ourselves and declare it OK, and then it fails spectacularly, aren’t we in line for legal action? Best off sending them all off to Shimano then!’ Seems Shimano disagree…