Debain and Fedora are 100% free software operating systems.
Point at a single package in either one that is proprietary software.
Driver firmware does not count. Why? Because that is hardware. The hardware is proprietary regardless and there is proprietary firmware in my hardware regardless of what my OS does.
None of the operating systems listed run on “free” hardware, so arguing about how free the non-free hardware is is meaningless.
Calling Debian and Fedora “closed source” or “black box” because they distribute firmware is madness. Hardware that cannot be updated at all is less “black box”? If that is your view, your opinions hold no weight with me at all.


If somebody says they cannot use wallpapers on other operating systems, just give them a thumbs up and move on.
Why would you want to recruit such a person.