Cheating in video game is a rampant and persistent threat to competitive games' reputation. This is especially the case when they manage to climb the entire ladder and land the #1 spot by DDoSing people like it happened in Mortal Kombat 11.
High ranked Mortal Kombat 11 players have trouble completing certain matches these days, let alone winning them. This is a result of a certain player DDoSing his opponents. Once they are forcefully disconnected, the cheater grabs a few points from the automatic victory and climbs ranks.
The person in question used to be named pa3com but changed their PSN ID to Son-Goku-DZ, besmirching the name of one of the most beloved characters in all forms of modern media in the process. It was also reported the cheater changed their name to pa4com at some point as well.
Finding the cheater on Mortal Kombat 11 leaderboards shouldn't be an issue, despite the frequent name changing, since they are sitting at the top of the ladder in the Elder God bracket.
Not many people actually managed to reach the bracket yet and it's possible the cheater was the first one to do so. Disillusioned players are calling for NetherRealm Studios' action, to which the studio already replied by stating they are doing everything in their power to deal with the menace.
Considering this is PlayStation 4 we are talking about, it's quite possible there isn't much the developers can do on their own though, due to the closed system nature of the platform.
Sony, on the other hand, absolutely has the power to take the troublesome user down and at this point, it's hard to imagine that they wouldn't take any action.
It appears that the sole purpose of this account was to grief other players on the ladder since the community figured out the player didn't do any of the singleplayer content.
Considering this is obviously a dummy account, it would be rather satisfying if Sony eventually brought the ban hammer to the person's main account as well.