Using a third party source and not a manufacturer will run the risk of having non-authorized parts used in a device. Those that use a third party, and not the manufacturer cannot then bring about a lawsuit when their device doesn't work properly. They took the risk of going on the cheap, and are paying the price for it. In the end, there isn't a legal issue there. The manufacturer warned of this consequence, but left the responsibility of choice up to the user, who made a bad choice. The user is the one who is left paying the price and is now looking to someone else to blame instead of taking responsibility for their actions. It's pretty open and shut on that case. If this was to go to trial, a judge would be able to be convinced from Apple's lawyers that this case didn't even need to see the light of day.