> The "business" ended when the sale transaction concluded.

Actually not, though not in a way that makes the rest of your post incorrect.

Various laws and regulations state that the seller has responsibilities to the buyer after the initial transaction has completed, one of which Bambu might¹ be transgressing by removing features that people we lead to believe were part of the product, and could reasonably expect to remain part of the product, at the time of the sale.

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[1] This has not been tested in court, and I'm no lawyer, take my idea of what is the case with a requisite serving of condiment.