Honestly, it should be more freedom from addiction. Porn isn't harmful until it becomes addicting. Drugs can boost creativity until you become dependent (although admittedly these can have a greater chance of harm, caffiene included). TV binging, scrolling the internet, all these can result in inspiration until it becomes a required habit
Maybe rework the message so Freedom From Porn is symbolic of Freedom From Addiction, and the ability to generate ideas without needing to nut first, or take drugs, or scroll endlessly through videos and stories, or playing non stop games, etc.