Fedora threatened with legal action from OBS Studio due to their Flatpak packaging
(www.gamingonlinux.com)
There isn't one. It's still a shit show.
The most reliable way to distribute software on Linux is still to make a statically linked binary (linking with a very old glibc is fine) and use curl | bash. But that isn't always possible depending on the language used and the app.
Seems like OBS Studio is C++/Qt, so it shouldn't be too difficult though. I've done it before in the distant past. But looking at their releases they only provide .deb for Linux, so I can understand why people would want something else.