Note that DLSS 2.0's model is not game specific ( https://www.nvidia.com/en-us/geforce/news/nvidia-dlss-2-0-a-... )

DLSS support is still game specific as it needs additional data beyond just the color buffer to do the up-scaling, such as motion vectors, but it at least doesn't need the expensive part that put it out of reach of eg. indie games.

So it's now on the "if unity & unreal support it, you'll see everyone have it in a few years" trajectory. Probably, anyway, similar to things like TXAA & FXAA.