Not all GNU/Linux distributions ship with a Linux-libre kernel, which is a kernel that has removed all the nonfree components such as binary blobs. The Free Software Foundation maintains a list of distributions that use Linux-libre kernels by default: https://www.gnu.org/distros/free-distros.html
More on Linux-libre: https://directory.fsf.org/wiki/Linux-libre https://www.fsfla.org/ikiwiki/selibre/linux-libre/ https://jxself.org/linux-libre/
I recently installed GNU/Linux on several computers (I have a few more to do this on), and I chose a Linux-libre distribution rather than my earlier Debian/Ubuntu based choice.
yea, debian is great and foss, but the fsf are very extreme on what counts as foss, so if you do as far as provide official documentation on how to install/maintain non free software they will pull your endorsement. and imo there definitely are legitimate usage cases for nonfree software, but the fsf dares to disagree, if you need nonfoss software, you just shouldnt do the thing you need it for, even if its your livelihood.