F. Massacci et al., "“Free” as in Freedom to Protest?," in IEEE Security & Privacy, vol. 20, no. 5, pp. 16-21, Sept.-Oct. 2022, doi: 10.1109/MSEC.2022.3185845.
This also discusses one of the "protestware" cases from the FSE'22 article. And it takes an even more protest-hostile approach. Some quotes: