I agree with not overly fanboying, but “they might stop support” can literally happen with any platform. If AMD stops open source support, they’re in the same boat as NVIDIA but with a leg up from having all the history an experience from the time with support.
Your favorite distro could go out of support and have the project closed tomorrow, just like Windows 10 reaching EoL. Except someone else can fork that distro and pick up the mantle to continue the project.
That game that you really want to play on Linux might suddenly choose to implement an anti-cheat or DRM that isn’t compatible with Linux, or a different game might choose to remove that block and it suddenly opens up for the Linux community.