Excel spreadsheets might end up having errors from people (mis)using =COPILOT formulas, but this will never be a problem in other office suites. Hosting your project on GitHub might attract stupid pull requests from clueless people (mis)using the easy Copilot pull request functionality, but this will never be a problem on other forges.
Maybe the market will respond to this long-term?
And I'd do that by writing out the function in Excel? :)
It could allow Microsoft to threaten to use trademark law against competitors who support the Excel file format.
It would also mean Microsoft would need to provide indefinite support for a function name that might not survive more than a few marketing cycles.