yes, because its important to put up an artificial barrier to performance for a grand total of 4 games anyone plays with ray tracing on, that they can actually tell it's on.
all ray tracing is, is physx version 2. there were free software solutions that did this. nvidia took one, made some specialized hardware to encode the software solution and new software to interpret it and sell it back to people and make an artificial barrier for competition to make the sheep who have elevated nvidia to a status symbol in thier head feel better about paying 20% more for the same raster performance as team red.
in another 3 years they'll have a new tech doing the same thing. stuff that was done just fine with free software, that they'll turn into a quasi hardware solution and sell back to devs in their dev tools so the devs get a less functional version of what they already were using...