Nobody

It’s a utility app that is that is available on Linux, Windows, MacOS, iOS, Android. It’s a decently popular app and is more likely to be used by regular people than in a business setting.

It’s in the top 50 most popular apps on Flathub.

Ubuntu being shit for personal users is all but new (Who wants 2 year old software?

A lot of people. From a snap I maintain:

So not only are some people fine with 2 year old software, they’re choosing to use 4 year old software more often than 6 month old software (granted in this second case, you can argue it’s because Ubuntu promotes the LTS as the main version).

That’s misleading, there was a significant outlier. Gnome was on average slower, but not that much slower.

Flatpak cannot access the host GPU drivers, so there are runtimes for NVIDIA drivers.

What they are referring to is that the driver version on the host must match the driver version installed as a flatpak runtime. Otherwise, you may get graphical issues and crashes.