What should one do who has installed an internet device and activated a feature to block certain content that he deems forbidden, but this has resulted in blocking some important scientific materials for certain users? And does he bear the sin of others using the internet for forbidden things?

Blocking pornographic websites is obligatory, and this is done by changing the evil with one's hand, by preventing access to these pornographic materials for those who view them. It is not permissible to aid anyone in sin. As for purely scientific medical websites, it is permissible to access them for medical students due to educational necessity, which is assessed on a case-by-case basis, as are websites that have no prohibition against entering them. However, pornographic websites must be blocked, and one who fails to block them incurs sin.