Why don't companies have someone in product development who's entire job is to point out less than desirable ways people will use their products, or protect against rule 34 or the like? The internet has been around long enough that it shouldn't have been a surprise that there were people who wanted to fuck a plastic lamprey eel. How as this even surprising?
QC detects problems. QA predicts, mitigates, and resolves problems. QA is the first to go when it's cheaper to scrap problems rather than make perfect product. QC goes when companies can outsource it to supplier-reported inspections and then leave it to the customer to act as final inspection. The Amazon method that everyone has to follow if they want to stay competitive