Microsoft is using the Copilot term everywhere - in GitHub, Visual Studio, all the Office apps etc. They have rebranded the Power Platform Virtual Agents builder as "Copilot Studio", and chatbots in your projects are known as copilots.
I would be very surprised if you didn't receive legal challenge to your use of the name, if you grow in popularity.
I would be very surprised if you didn't receive legal challenge to your use of the name, if you grow in popularity.