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.
Here is another thing that you might find interesting. Debian has made a commitment to make every software package in their distribution into a "reproducible build". This means that the same source code compiled on 2 different computers of the same architecture will produce the exact same binary.
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