Eventually someone is going to get a bill for the OpenAPI key usage. That will provide some incentive. (Incentive to just rotate the key and brick all the devices rather than fix the problem, most likely.
Had you ever heard of IKKO before this? I hadn't, and I'm at least adjacent to the hifi and audio nerd crowd.
Apple have a reputation and brand that allows them to charge premium prices.
IKKO seems, at least to me, to be effectively a disposable brand. If their reputation goes bad, their only reals costs are setting up a new website/AliExpress Store/Amazon seller account.
But that at least turns it into something customers will notice. And companies already have existing incentives for dealing with that.