AI companies are actively marketing their products as highly intelligent superhuman assistants that are on the cusp of replacing humans in every field of knowledge work, including medicine. People who have not read deeply into how LLMs work do not typically understand that this is not true, and is merely marketing.

So when ChatGPT gives you a confident, highly personalized answer to your question and speaks directly to you as a medical professional would, that is going to carry far more weight and authority to uninformed people than a Reddit comment or a blog post.