There are several benefits to keeping one's face hidden online. First, it can help to protect one's privacy. When someone's face is not associated with their online identity, it can be more difficult for them to be tracked or identified. This can be especially important for people who are concerned about their safety or who want to avoid being harassed.
Second, keeping one's face hidden can help to create a sense of mystery. This can be beneficial for people who want to maintain a certain image or who want to avoid being judged by their appearance. It can also be helpful for people who want to focus on their content without being distracted by their personal life.