Contact the platform to demand removal. The porn industry has SOPs for dealing with this problem, I am not a lawyer but I imagine that process can be generalize

Contact the platform to demand removal. The porn industry has SOPs for dealing with this problem, I am not a lawyer but I imagine that process can be generalized and legally enforced If that someone shared it on their own website, hosted out-of-country, on their own hardware... well, I can't do anything about that but i also wouldn't care. It's clearly non-authoritative and won't get SEO traction by itself.