Thanks for trying. I wasted a day yesterday trying to get rid of Copilot. It is total BS.
Microsoft staff can only suggest suggest unsubscribing and reverting to an older version of the software! Imagine what could go wrong! Then, future updates will be necessary for functionality and will likely bring Copilot back (unless MS wakes up to the problem this is for many people). Copilot should be opt-in, not opt out (and opting-out means a whole lot of work with no guarantees of future functionality).
I do not pay Microsoft for an Office sub to have them 'help' me by gleaning my data, 'learning from me', and appearing (as an annoying icon) on each line of my intellectual property/work. There are also enormous legal ramifications for students and academic writers who have no desire to 'cheat' by allowing AI to write or organize their work.
And for those of us currently writing creative texts/fiction, that Copilot icon in the margin of each line is unbelievably awful. And I certainly do not want Microsoft contributing to or mining my work in any way at all.
Microsoft must remove Copilot from user accounts which did not opt in.