In 2015, Tyson Kidd's wrestling career was brought to an end when he broke his neck during a match with Samoa Joe. That happened when the former NXT Champion used the Muscle Buster on his opponent during a dark match and while he continued to use it here and there, we've yet to see it unleashed on the main roster (despite it being teased quite a few times in some of his biggest matches).
During a recent interview, Joe was asked about the Muscle Buster being used in WWE at some point and provided what appeared to be an in-character answer about whether or not we'll see it again.
"The Muscle Buster is something I use at my pleasure when I choose to," Joe responded. "Trust me, when the opportunity arises and the conditions are right, you never know what I’ll pull out. Maybe I’m not ready to pull it out of my arsenal yet." Is WWE saving it for a big moment or is it banned just like the Curb Stomp was for a time? The latter seems like the most likely answer!