Didn’t NVidia drop support for gamestream? To use that protocol with maintained software, iirc you need “Moonlight” on the device acting as your screen/controller, and “Sunshine” on your gaming pc.

Most of these projects are FOSS, so you have two options. Either ask the devs for OpenBSD support (but try installing everything on OpenBSD to see what goes wrong). Or try modifying the program yourself to add OpenBSD support.

Developers of these projects often target Linux, since it is by far the most used server kernel/OS. *BSD is not nearly as common.

The only way to potentially change that industry wide is to have enough people stubbornly use *BSD and help implement *BSD support for Linux specific tools they use.

Official support is often only provided with a docker setup as it standardizes bundled libraries and other needed blobs. This makes it easier to support many Linux distros.