Does sin befall a person who repented of previous sins related to directing individuals online to perform specific actions with their bodies, if these individuals were harmed or died because of that, and does this entail fasting for two months or paying blood money, knowing that their fate or religion cannot be determined?

If someone invited others to a sin and then repented, they have fulfilled their obligation, and the continued engagement of those invited in the sin does not harm them, as they are responsible for themselves. However, it is recommended for him to advise them and call them to repentance if he is able to, and this is part of the completeness of his repentance. If he loses contact with them, then there is nothing upon him. He must beware of obsessive doubts (waswasah) that would make repentance and worship difficult for him. Expiation (kaffarah) and blood money (diyah) are not obligatory based on doubt.