This seems mental to a lot of people, but it happens, i'm not saying it's definitely true in this case, but it happens.
When you used to be one of the best, and on that journey got lots of attention, lots of compliments, but then it becomes so normal for that person to do good they don't receive as much attention anymore. I've seen people in this situation take on the identity of a noob, or someone that hasn't played for many years, because it gives them attention and compliments again.
Look at music, artists become a huge thing for a while, topping charts everybody loves them, radio playing their music everyday, then all of a sudden you are like "I haven't heard of xxxx for a while, I wonder what happened to them". Now, these bands just stick with their loyal fans, move on gracefully, and get on with life. But they don't have that buzz of being "The new hot thing" ever again, and for some people being that "new hot thing" is the best feeling in the world.
Granted, it's nowhere near as common in such a little game like Worms Armageddon, but the general idea is the same, and some people like being the centre of attention.
On the other hand, some people do it just to see how people react, and others might do it for privacy.