This is like an ISP asking how they can get hooked up to the internet.
Apple didn't start manufacturing with mega Foxconn contracts. They had to figure that out along the way as their scale demanded.
However I share your sentiment: doing things the same way but cheaper is usually not the solution. Doing things differently (in-sourcing) might be the path forward.
Apple created something people wanted and sold at a price that would still make money if it was assembled by hand. They didn't form a company around a commodity like data storage.
Data storage is a commodity. Everyone already has some, online storage companies already exist. If you don't know how to store a lot of data and your company's whole purpose is to store a lot of data, it sounds like something that should have been worked out before making the company.
