Moonlight uses the driver side of this. If they are depreciating their in house client side then I imagine the driver side is about to be killed as well, meaning Moonlight may be about to be unusable.
I'm absolutely devastated NVIDIA are like this, we can't let them do this. It's such a useful feature with the best latency, stability, and overall performance. With AV1 HW encoding this could've become even better with 4K HDR 120 FPS with minimal bandwidth requirements.
Moonlight is open source, and there is an open source server (Starburst?) if you're really interested. The open source server is multiplatform as well.