I feel that training copilot on Github repos without maintainer consent was a betrayal - this pushed many projects over to Gitlab.

You could say the same for any content used for training.

You could and you should.

"The unknown thing to be known appeared to me as some stretch of earth or hard marl, resisting penetration... the sea advances insensibly in silence, nothing seems to happen, nothing moves, the water is so far off you hardly hear it... yet finally it surrounds the resistant substance."

A. Grothendieck

Understanding mathematical ideas often requires simply getting used to them