Try Moonlight, similar tech but open/no cloud auth. Works better over local networks though as opposed to internet (which you need to set up via vpn/portforward etc)
Sunshine/Moonlight are awesome, but fwiw in this specific context it's worth noting that macOS support with Sunshine is still extremely experimental and janky. It's Homebrew only for now, and when I tried it out last the main release didn't install at all, only the beta. And then locally even over a 10 gig network while the image quality was great the latency was abysmal, even before other oddities. I will say this is enormous improvement over even a year ago, but given the initial gaming focused use case I suspect that (not at all unreasonably!) they've prioritized client capabilities when it comes to Macs for now.
Last I looked, they didn't support passing through USB devices like Wacom tablets or edit controllers or space mice. I am eager for that stuff to work so that I can start using moonlight/sunshine for more of my work.
This bummed me out, but it looks like it's not? From the Sunshine (server) GitHub page[1]:
Sunshine is a self-hosted game stream host for Moonlight. Offering low latency, cloud gaming server capabilities with support for AMD, Intel, and Nvidia GPUs for hardware encoding. Software encoding is also available.
