Most of my friends aren’t Linux/tech enthusiasts at all, but they do build their PCs because it’s cheaper, and they’re all over intel and nvidia. One even asked me for an advice on what GPU to get under a certain budget, and the fucker wouldn’t listen to my AMD recommendations, despite the very obvious advantage to his wallet and performance he was looking for.
Intel + Nvidia pretty much dominate the pre-built market, too. I was in a tech store recently and, as usual, gazed at some PCs and laptops they had over there just for the sake of it, and nearly every single one of them was intel+nvidia, for the very exception of a full AMD laptop.