When I got my Airborne 25 years ago, it came with a small packet of copper anti-seize. I had ordered an optional titanium seatpost, and the anti-seize was recommended for use to prevent "cold welding" of the seatpost to the frame. I've refreshed this 2 or 3 times over the years, and there's been no evidence of bonding. This is the only application for copper-based anti-seize that I've ever heard of, though I will readily admit my experience in this area is limited.