NVIDIA: because they choose to ship their own poor replacement for the entire graphics stack
Other: The driver is already installed!

I'm gonna assume you're having the old Steam runtime issue, try the LD_PRELOAD workaround here:
https://wiki.archlinux.org/index.php/Steam/Troubleshooting#Dynamic_linker

If you wanna run a bleeding edge rolling release like Antergo you're gonna have to deal with this sometimes unfortunately