Since becoming *G, I’ve been op-upped maybe two or three times on AC YUL-ORD. Prior to being *G, I’d see op-ups on that flight, but never got one, so I’m assuming that *G status played a role.
FWIW, the op-up on AC only happens when they have a W&B issue requiring pax to move forward, or when they’re oversold in the back.