Microsoft got Copilot. They were first to establish the brand. OpenAI technologies let them do it. I don't know how much Copilot brand cost, but right now when you're thinking about AI-assisted programming, Copilot is the first thing comes in mind. So probably they got something in return.
Not only Github copilot but the general copilot integrations announced at Ignite for Microsoft 365 and other apps means a much deeper full on assistant integration for whole ecosystem.
> For business and for the consumer. They can retire Bing search at this point, making it Microsoft Copilot for Web or something.
Nah it would make it too understandable. It's Microsoft, they'll just rename Bing to Cortana Series X 365. And they'll keep Cortana alive but as a totally different product.