Apple is different because they have a product that is not comparable to other PCs, or they want you to believe that, thus they can put the price tag they want on it. Want they spend 100$ on a trackpad, they can, but a PC manufacturer can't.
Beside that, I think also the reason why PC manufacturer didn't invest on them is that most PC have Windows on them, and native multitouch trackpad gestures on Windows is rather a new thing (even on Linux, by the way, it started being supported as smoothly as macOS only with Wayland). Thus why have an hardware that supports something than in the end the OS that most people is using doesn't support?