Yes, it is only a part of DeepSeek's inference. Alongside openrouter there are others (probably many) doing this gateway work (for example opencode and even huggingface). Also the gateways in China itself, and of course also non gateway inference, DS itself directly providing inference.
Wow, nobody mentioned kanata yet? It's literal gamechanger for keymapping literally anything-to-anything, including mouse movement via keyboard. Opensource, cross platform, 7.5k stars on Github.