You are saying that, like Nvidia GRID drivers are open-sourced while
in fact they're super far from being that. In order to download
drivers not only for hypervisors, but also for guest VMs you need to
have an account in their Enterprise Portal. It took me roughly 6 weeks
of discussions with hardware vendors and Nvidia support to get a
proper account there. And that happened only after applying for their
Partner Network (NPN).
That still doesn't solve the issue of how to provide drivers to
guests, except pre-build a series of images with these drivers
pre-installed (we ended up with making a DIB element for that [1]).
Not saying about the need to distribute license tokens for guests and
the whole mess with compatibility between hypervisor and guest drivers
(as guest driver can't be newer then host one, and HVs can't be too
new either).
It's not that I'm protecting AMD, but just saying that Nvidia is not
that straightforward either, and at least on paper AMD vGPUs look
easier both for operators and end-users.
As for AMD cards, AMD stated that some of their MI series card supports SR-IOV for vGPUs. However, those drivers are never open source or provided closed source to public, only large cloud providers are able to get them. So I don't really recommend getting AMD cards for vGPU unless you are able to get support from them.