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>Then I got their chat to tell me what their model is based off of and it said ChatGPT

The same is true for Llama, Claude, etc. The internet is polluted with GPT stuff so of course LLM's will hallucinate that part. LLM's do not know about themselves.

Why do they have dns records around copilot and openai then?

This commenter was faster: https://news.ycombinator.com/item?id=42861914

I think you're misunderstanding the answer here. By asking that you're assuming that the model has a self-awareness but most models don't. Think of it as a common question asked on internet. They just have a training data and answers are from that. And Chat GPT is mostly talked about on the internet, so you get that answer. You can replicate this behavior with most open source model.

Maybe they've used those names to test their OpenAI-compatible API (https://api-docs.deepseek.com)?

What is the utility in having api-openai-us1.deepseek.com domain?