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It's an issue that's been going on like ten years with various road ht2 cranks. Shimano warranty occasionally have done then when under the 2 or 3 year 105 or ult limit. But can tell you now, retailers regardless if being the original seller get £0 for the labour, postage or dealing with customers, always been a gripe that they just leave you hanging out to dry. Especially with shimano steps products, e6100 being an absolute shit show of a product.
BrickMan
I'm trying to get my head around this mess. The bit which fails first is the glue. It happens in older, heavily used cranksets. Maybe Shimano knows why, but they're not saying. It might be corrosion and/or the atmosphere at factories in far east climates. After the glue comes unstuck the aluminium drive side arm has to bear a much higher load than it was designed for, so it gradually weakens and loosens and eventually snaps.
If Shimano says your crankset might be affected, but it hasn't snapped yet, you don't automatically get a replacement. First a bike shop is supposed to inspect it. We don't know what they're supposed to look for. Perhaps they give it a wiggle to see if the glue has failed? And perhaps Shimano believes that if the glue hasn't failed yet, it never will? Or it will fail in such small numbers that they don't care about the legal and reputational repercussions?
Lawyers and regulators think that every vulnerable crankset should be replaced. In other words, a full recall, as seen in other industries.
Shimano is being obstinate and arrogant and incurring the wrath of dealers and distributors. Could this go all the way to a humiliating climbdown and televised tearful apology from the big boss? It's still a family business. Four of the top people are Shimanos. The family owns 11% of the shares. Not the sort of thing associated with progressive corporate governance.
Shimano has 50% of the world's component business, and 70% of the high end. But the Covid boom is over. Component manufacturers' revenues for 2023 will be 25-30% down. The market is oversupplied. Disgruntled Shimano buyers have other options. Maybe this will be a turning point, with Shimano' s monopoly being slowly lost to the likes of L-Twoo.
Sources:
https://road.cc/content/feature/investigating-shimanos-snapping-cranksets-304173
https://road.cc/content/news/solicitors-view-shimano-cranks-roadcc-podcast-304479
https://seekingalpha.com/article/4572435-shimano-bike-component-monopoly-at-an-attractive-price
https://www.forbes.com/sites/carltonreid/2023/08/11/cycle-industrys-collapse-after-bike-boom-ends-this-year-say-analysts/?sh=7c3efbab66d9
https://road.cc/content/tech-news/budget-groupset-going-take-over-shimano-di2-300065