Answer: Bing provides GPT4 for free with integrated search to ground the response. It’s a totally different experience than free ChatGPT that some people would prefer.
Maybe I'm holding it wrong, but I tried Bing with GPT4 and I got really useless answers. Maybe I'm just used to the chatGPT interface.
Edit: I found the bing interface confusing. I couldn't really distinguish between the AI bit and just searching. When I asked how to write some code that did X, I got a bunch of links to stack overflow or whatever. I wanted the ai to write some code for me.