Legitimate parts that fail quality control testing in China have a way of "falling off the truck" onto the loading dock of the fulfillment center used by unscrupulous third party vendors instead of being destroyed.
Cool story. But when I get a replacement battery pulled from a brand new iphone with the 3rd party repairer providing warranty on their work, I still have no way to make that message go away other than to pay Apple's extortion fees.
Fun local fact: unless you order your battery at iFixit and DIY, it’s cheaper to go to the Apple Store to change an iPhone battery than any of the repair shops nearby.
Fun reality check: for many people, going to an Apple store means driving several hours, or even purchasing a plane ticket. Any reasonable accounting of that would massively inflate the cost of 1st party repair.
Why would a repair shop rip a battery from a brand new phone to sell the battery to you? They ruin a new phone to sell you a $20 replacement battery? Now what will they put into the formerly new phone without a battery? Third party junk that some unsuspecting buyer is going to buy thinking it’s a “new” phone?