https://huggingface.co/spaces/lmsys/chatbot-arena-leaderboar...
Also, llama.cpp makes inference accessible for a lot of people, and it's not available for RWKV.
Not to knock on the model, I'm sure it's good. I also like that it's a succesful example of citizen science.
It's just not popular enough to have the inference infrastructure transformers have, not established enough to attract enough money to get 60B+ models trained, and so on.