

If you do not want to use software written by Red Hat, you have to stop using Linux. Quite frankly also much of the GNU suite such as Glibc and GCC. You would absolutely have to stop using either Xorg or Wayland. Systemd is just an example of something Red Hat created but they are massive contributors to a lot of other surf too.
I you want to avoid software written by profit motivated companies, you are down to about 15% of the open source ecosystem.
Even those distros are only possible if you arbitrarily decide the firmware is not software. If you want to be more honest about having free software all way down, you have to avoid AMD and Intel CPUs at the very least and most GPUs too. And, if you are not going to do that, why fuss about the BIOS?
Unless you are using a totally Free Software stack on on Open Source CPU with an Open Source ISA, it is just a question of where you draw the line between convenience and “principles”.
There are truly Open Source RISC-V CPUs. It could be done. That is not what those “libre” distros are doing.
Since none of us are using a 100% free stack, I think distros like Debian strike the right balance between “free” and “useful”.