They can just change their EULA to make the act akin to old fashioned piracy. The free software movement eschews such instruments by definition, so we're fucked.

I mean, they can write anything in their EULA, I'm talking about enforcement. Sure, most free software advocates are squeamish about good old fashioned piracy today but I don't think that's an immutable fact of life.

The best anyone can do is send takedowns to GitHub / other websites hosting the code or downloads but it's trivial to upload them to random russian code forges or whatever.