Actually, things could be much easier.There is already to some extent neutralized Firefox: https://trisquel.info/en/browser
. And it's possible, but not very probable that nobody will notice when they start to censor or favor some information over other. (Though they already distribute #propaganda
through their channels.)
Would be nice to have more things like that.
PureOS, for example, who fork it.
Though FSF and RMS are far from neutral and tech freedom focused. Network of watchers is needed.