Yeah it's such a confusing jumble. The Microsoft people we work with even get confused about which feature is in which copilot. And they keep changing stuff around. Until last week the copilot button in windows 11 worked fine with business M365 accounts but now you get a screen saying you must have a personal account.
They're so hell bent on rushing this to market that they don't know what they're doing anymore.
What OpenAI might call a gpt, or others a chatbot, Microsoft calls a copilot.
And all their copilot offerings are named copilot, and sometimes you are lucky enough that there’s a second word in the product name to differentiate it from the other products.