Tell HN: Linking to lmarena.ai is banned, site-wide on Reddit

This must be a bug, or maybe something more interesting? On any sub, if you post a link to LLM industry fave site Chatbot Arena (LMSYS) [0], it will get [removed by Reddit]. I just listened to the latest Gradient Dissent pod, and the creator of lmarena.ai was hoping to get more non-industry users to use their site. What is going on here? [0] https://lmarena.ai