Bottom line is Apple wants the products you paid for to be used in the way it approves of, and thats why Photofast is being bullied into not selling this SSD.
One, you don't know that any bullying took place. It is total conjecture that Apple has threatened their MFI membership. Second Photofast is marketing these using Apple's trademarks without permission. And under US law if you don't protect your mark you can lose it. So of course Apple is going to point out their error and firmly ask them to stop