Rest of the World has published an article showing how the accounts of Chinese dissidents get flooded with spammy adult content every time they post something critical of the regime: https://restofworld.org/2023/chinese-sextortion-scammers-are-flooding-twitter/

Something similar happened last year when Chinese porn spam bots flooded the site in an attempt to mask news of anti-Covid protests in China: https://www.washingtonpost.com/technology/2022/11/27/twitter-china-spam-protests/