The SD Association (Toshiba, Panasonic, and Sandisk) +Lexar (Micron) have the highest technology.
They make money by producing the highest capacity (right now 19-20 nm technology) that's how they made microSD 64GB or SD 128GB. & the fastest.
also you don't have to forget the reliability & security (micro controller generation & other factors has a high effect on the result & ...).
Other company have to buy their nand technology from these sources for their devices.
This is how they make money most companies can't catch up to these companies so they have to provide their needs from these few companies.
these four companies won't never thing of such things. in the 3 Trillion dollar market of nand memories such thoughts that you mentioned they really don't make sense.
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