I get that win trading and account sharing were a thing in Vanilla but that doesn't mean they should stop being actionable.
If someone is making money by selling HKs to a load of ranker tryhards then something probably *should* get done about it, whether or not it happened once in Vanilla that one time. Weird that so many people seem to boil this down to "they want to brag about their premade not losing" or "hurr durr you think you do but you don't".
It was obvious well in advance that the PvP system in Classic if left as it was would need healthy scrutiny to prevent people getting a massive advantage through breaking the ToS and that that scrutiny was never going to occur. Nevertheless saying "So all of this is kosher" is clearly absurd.