It must be pretty expensive to port/test all of their patches/updates on something few use [0.70% per [0]). They already killed it on their server line (although it was silly on there with the low memory limits). Nvidia has already announced they're ending support[1].
[0] https://www.pcbenchmarks.net/os-marketshare.html
[1] https://www.extremetech.com/computing/267180-nvidia-ends-sup...