Outside of software spaces the discussion around copyright seems so much more nuanced. Any creative commons license is generally considered “copyleft” regardless of the details, and some are far more restrictive than the FUTO license. Consider projects like Wikipedia which accept content licensed under GDFL, or CC-BY, or CC-BY-SA, Apache 2.0, or PD.
I am not a programmer, so maybe I am missing a huge piece of context, but what is the insistence in the free software community for what seems like total license purity? I even see software engineers arguing that “everyone” should use Apache or MIT and not the other, which is somehow bad for the FOSS community. What am I missing? Isn’t more free better than less free?