GNOME isn’t actually based on GTK, the shell has its own widget framework called the Shell Toolkit: https://gnome.pages.gitlab.gnome.org/gnome-shell/st/index.html

Most people downvoting almost certainly only read the title. I do agree with what’s being said, I just don’t like the style, but that’s just a taste thing. The title is bad though, it’s not relevant to the article and is factually wrong, unless I’ve missed an announcement of Valve have given Flatpak/Flathub guys money.

I don’t think I’ve ever read an opinion I agree with expressed this disagreeably before. The title is also weird given Valve doesn’t officially support the Steam flatpak and AFAIK hasn’t given any money to the flatpak devs.

Do note, literally anyone can submit a change proposal to Fedora. This shouldn’t affect your view of the project.