Im sorry, you mean this ?
What “more punishing than ever” are you talking about? This has always been the case.
Being a greafer and deliberatelly playing to troll other people is against the GTAC of Blizzard. Always have been.
And any action you take can get you banned. That includes stalking people, excessive ganking in open world PvP, and… repeatedly leaving keys…
You still are. Key element is “repeatedly leaving keys”.
And there are only 2 reasons why someone would repeatedly leave keys (not ocasionally):
(A) You treat other people as NPCs and deliberately fail keys because you dont pull your own weight on the group, and blame “PuG world” for that… OR…
(B) You want to deliberately troll strangers on the internet.
Those are the only 2 reasons to deliberately and consistently feel the need to leave keys all the time. Both of which have an easy solution: L2P with other people, or, stop being a jerk.
If you dont qualify for either of them, then you have nothing to worry about.
And also:
It dosent matter if levers are punished or not. It still dosent change the fact that keys are made to be done in a team. So NPCs wont work.
So what you are asking is STILL not possible.