Samsung or LG is selling those to everybody
Of course they are, and always were. Like with for example memory, there's only a handfull of panel manufacturers everyone else is buying from and repackaging into their own product.
Samsung Display that manufactures the QD-OLED panels is a separate company from Samsung Electronics
Yes but actually no
I know OLED is the belle of the ball but where are the mini led models? "Philips" announced the Evnia 32M2N6800M back in february and it's yet to make an appearance anywhere