Why do NVIDIA video cards have so many different manufacturers (ASUS, MSI, GIGABYTE, etc.)?

Question

Video cards

Hello.

If these cards are manufactured by NVidia, then who are "all these people"?
Yes, I see that they hang different cases, cooling systems, etc. on top. But what do they have to do with these cards?
For comparison - there is an Intel processor. And no more MSI/ASUS/-Intel companies. Only Intel.
PS
I apologize in advance for some ignorance or some obvious misunderstanding.

Answer 1

Nvidia only makes chips and exemplary motherboard designs. Well, and also the founders edition.
"these people" are Nvidia partners who buy chips in bulk, get all the necessary documentation, and design/manufacture their video cards based on these chips.
In the case of intel, in fact, it is similar, only not with processors, but with motherboards - Intel transfers documentation to its partners, and they make their motherboards based on this documentation.

Answer 2

NVIDIA gives the chipset technology
a specific implementation that the manufacturer makes and brings to the consumer