I don't agree with that.
Ubuntu and the likes... Yes. They, obviously, don't care about the Freedom
issue - and even facilitate the installation of (more) non-free software.
In Debian's case, I think they're just being pragmatical.
(https://trisquel.info/en/forum/how-many-people-are-working-trisquel-which-libre-linux-distro-has-most-developers#comment-42517)
(Although, I can also understand the need for - and, even like better - more
intransigent distros, like the ones approved by the FSF.)
In my personal case, I can't install* the free driver for my graphics card,
in my main computer, because - of all the different graphics cards, that are
supported - the free driver overheats my particular one.
Should I, then, move back to Windows? Me, and all the other people that don't
have compatible drivers?
Isn't it better to have a "mainly free" OS, then?
And, don't you think that Debian, by allowing the installation of non-free
drivers, or software - but, by *calling people's attention to such
distinction* between the software types - is making more people adhere to the
Free Software ideology - even if not completely, at start? (Contrary to, if
no such distribution, like Debian, existed?)
I started with Debian, also - while getting the point about Free Software,
liking the ideology very much, and always wanting to completely adhere to
such ideology...
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* (well, actually, I could - but would face a huge risk, doing so)