I believe so, yes. Other than that there’s the official closed driver. Nvidia also “open-sourced” their driver for the RTX 20 series and up, which you could technically run, but I didn’t hear much good from it.
I’ve heard that it’s not fully open source. Some components of it are still closed source.
Some people might have gotten their computers before using Linux, and the GPUs are either too hard to swap (in some prebuilts and most laptops), or new ones are too expensive.