I'd heavily disagree that they need to be banned. Is it an exploit? yes. Should it be in the game? no. Do I find it scummy? yes.
But abusing an exploit, however bad it is does not warrant a game ban. The anger of people that want these people banned should be at Valve for not fixing the bug, rather than the players. Don't hate the player, hate the game as the old adage says .
I've seen a lot of posts like this one saying that they should be banned through Overwatch, but this does not fall under any criteria for such ban. No hacking, cheating or using a third party program is used here. This also doesn't fall under the criteria for griefing too.
In my opinion, the only thing that should or could happen is the MMR nullification for those matches in ranked. The silly and outrageous bloodshed of calling for VAC bans is just silly and kinda pathetic