(trained upon our Github projects without consolidating with us if it was alright to do so)

Without having read it, I’d be willing to bet that the Copilot EULA requires users to agree not to sue Microsoft for any of their copyrights that might have been infringed. Personally, I think anybody who has a project on Github – especially one with a copyleft license – shouldn’t touch Copilot with a ten-foot pole in order to preserve all their legal options.