Surprised?
For years mobile companies have supplied refurb units as replacements, so why all of a sudden are people getting pissed at Apple?
The IT industry have always used refurbished parts for repairs. As for 'you don't get to keep the old parts shit' I can't recall an instance where any manufacturer/retailer offered you the faulty bits back. Often the 'faulty' bits are returned to the manufacturer for repair/test or ultimately if it's completely fecked the bin.