I don't support calling people who volunteer their time to develop free software "just shit", but I can't help but agree at least a little bit about redhat. Redhat is kind of like Richard Nixon: if you just assume that eveything you dislike is their fault, you would be right surprisingly often.
"Predictable" interface naming
avahi
dbus
That being said, they did also contribute to a lot of kickass software, from btrfs to Firefox to linux namespaces to qemu to pipewire, as well as to software that you can't really live without like glibc or gdb. So I guess the converse also holds: if you just assume that everything you like is there thanks to redhat, you would be correct pretty often as well. Can't really say that about Nixon though.