It’s not ego...it’s about not letting the wolf back in the hen house.
NVIDIA’s presumptuousness of their own preeminence got them tossed and hopefully they will never get back in the door at One Apple Park Way. They don’t serve their customers, they serve themselves.

Apple's management doesn't want Nvidia support in macOS, and that's a bad sign for the Mac Pro | AppleInsider
Apple just doesn't allow modern Nvidia GPUs on macOS Mojave, and this is a dramatic change from only six months ago. Given that a new Mac Pro is coming that could support Nvidia cards, and there are already eGPUs that should, it's time that Apple did.

Video: Nvidia support was abandoned in macOS Mojave, and here's why | AppleInsider
Apple's macOS Mojave is a great software update for most users. But, it isn't for those who are using an Nvidia graphics card in their Mac Pro or inside of an external GPU enclosure, so let's talk about why.