They would have to ban tens of thousands of people. XD The bug was shared on all major forums and sites and there are Youtube videos with 50k+ views and hundreds of comments of people confirming they did the bug too. Banning a good chunk of your player base will hurt NR/WB the most.
They should just acknowledge they messed up themselves, patch the bug out, but leave the people alone who made use of the bug. They wouldn't have used it if the grinding in this game wasn't so egregious. It's really burning me out to be honest.
If you think you can easily grind koins (which is indeed fairly easy now) and get all the skins and gear you want from the krypt you are sorely mistaken. I just can't find any of the skins that I really want in the krypt. There is no trace of any of the original color variation skins that are supposed to be found there, and I've unlocked all areas, unlocked all chests, opened nearly all Shao Kahn chests (though I already know what is in which chest since they are not random) and opened nearly all soul chests.
The only explanation must be that they put a good chunk of the best skins in the shrine slot machine. One try to win a skin costs you 100k though. :/
There were already many people complaining they put millions of koins in there and also didn't get any of the skins or gear that they wanted.
I've basically given up on finding Kitana's story and trailer costume and her maskless face at this point. Crazy they promoted the game with this and you are not able to obtain it in the game, even after 100%ing the krypt.