Nvidia will probably get better in the future (2024+) due to some great work being done on the open source driver. So as you say, I would also recommend AMD unless you rly need Nvidia for something specific like developing for RTX or something. I have recently gotten my Nvidia 2070 eGPU to work after many hours of debugging, while all my AMD cards work out of the box.
I believe he is referring to the fact that YouTube don't have to pay upfront for new content, they even get new content without hunting for it, and many smaller channels don't have partnership and so on.
Sure they have a platform, backend and so on. But Netflix needs to have all that too plus buy things to show to their customers.