>>davidg+(OP)
This exact code can be found 1000 times on github and many of those are MIT licensed https://github.com/search?q=%22cs+*cs_transpose+%28%22&type=.... Copilot, or any other developer or person, has no way of knowing where the original implementation came from or it's original license. The cat is out of the bag, get used to it.
>>nights+qD2
Indeed, not using GitHub is a step in the right direction.
What I am referring to is GitHub claiming that you are using their resources so they can break your license, when in fact you are not using their resources so they never made that agreement with you.