It's been said already in this thread that people are confused about what RTX is. And Despite two people explaining it, you still seem to be confused.
Games are built for Ray Tracing now. All the games out now that have Ray Tracing were made using Microsoft's DXR or Vulkan. If AMD had a Ray Tracing solution those games would be able to use it.
Suggest you read post number 34 by @LoadsaMoney Just in case you missed it.
not confused at all.Games built with ray tracing as the standard. not as an add on.