A takedown notice is unlikely, cursory legal action extremely unlikely, and I don't see Nijisanji putting serious effort into such a case beyond the threat of a lawyer. If a takedown notice gets sent, Proctor will just have a laugh and ignore it. Nijisanji is worried about the Japanese market, they're going to retreat from the English market, and I don't think they're going to put their effort into fighting an international legal battle because some retards said some stupid shit about Nijisanji on a foreign forum.