It’s frowned upon for a side to threaten another club with PSD, this ain’t any different. To try and jeopardise another club’s trade period like that is no different after pretty much expressing interest in a player.
If that’s the case maybe melb should throw Collingwood 2 first rounders, hold hands and sing Kumbuya to avoid a frown.
You know a team has no leverage at the trade table when they are relying on arguments such as this.