> What I can see is a fairly clear indication that they do not want contributions from people whose politics differ from theirs
This is the same FSF that in the past has refused contributions from people whose politics include "I would like this software to run on my windows/apple/other proprietary platform". They're extremely political.
But... that software (reaction) is not written by the FSF? They just use it
When did this occur? I am a GNU maintainer, and have never heard such a thing from the FSF. The GNU Coding Standards and other similar texts leave the decision to support non-free platforms up to the maintainer.